which statement correctly describes cell differentiation

Answers

Answer 1

Answer:

"Causes cells to change as well as specialize" is the correct answer.

Explanation:

There are several differentiations throughout the establishment of a multicellular because that evolves from some kind of basic zygote to something like an interacting entity's structure and indeed the cellular functions that comprise a whole species.Cells get specialized to accomplish diverse roles throughout this mechanism or procedure.

Related Questions

Which non-mineral nutrient is essential for photosynthesis? ANSWER ASAP!!!!!!!!
A.hydrogen
B.potassium
C.nitrogen
D. carbon dioxide

Answers

Answer:

A. hydrogen

Nearly all organic compounds also contain H atoms, which explains why plants need the H they get from water molecules through photosynthesis. Hydrogen ions are vital in both aiding proton gradients to help drive the electron transport chain in photosynthesis, and for plant respiration.

#CarryOnLearning

Answer:

carbon dioxide

Explanation:

because carbon dioxide is needed for respiration

What the Difference in guard cell during day and night

Answers

Answer:

the differences in guard cell during day and night is;

1 guard cell during day it always stays with us or follow us

2 guard cell during night have to look after us like we are their children..

The Gram stain provides a lot of clinically useful information but it won’t give you all the information you need for identification and treatment. About which of these do you NOT learn anything from the Gram stain?

Answers

Answer: d) The ability of the bacteria to process nutrients.

Explanation:

Incomplete question.

Options,

a) Structure of the cell wall b) Bacterial morphology c) Susceptibility to antimicrobial drugs d) The ability of the bacteria to process nutrients.

Gram staining is a type of differential staining to study bacteria, and is used to see cell morphology and to differentiate between gram-positive bacteria that appear violet and gram-negative bacteria that appear pink or red.

To perform the staining, fix the samples with methanol for one minute or heat and add a dye called crystal violet and wait one minute. Then rinse with water and add lugol for one minute. Then add acetone alcohol for 5-30 seconds. At this point, gram-negative bacteria discolor while gram-positive bacteria do not. After this, a contrast staining is performed by adding safranin or basic fuchsin for one minute. This stain will turn the gram-negative bacteria pinkish-reddish.

Crystal violet is a cationic dye that penetrates all bacteria through the bacterial wall. Lugol is a compound consisting of iodine and potassium iodide and acts as a mordant. The iodine enters the bacteria and forms an insoluble complex with the crystal violet, causing the crystal violet to bind more strongly to the bacterial cell wall. The added alcohol and acetone are used for decolorization, since the iodine/violet crystal complex is soluble in the alcohol and acetone. Thus, gram-positive bacteria do not decolorize, while gram-negative bacteria do.

A contrast stain such as safranin or fuchsin is used to highlight gram-negative cells. After contrast staining, gram-negative cells are pink or red, while gram-positive cells remain purple.

The wall of gram-positive bacteria consists of about forty layers of peptidoglycan which does not allow alcohol to pass through it because it is very thick, while that of gram-negative bacteria consists of a single layer of peptidoglycan. These differences cause gram-positive bacteria to retain the violet color and gram-negative bacteria to discolor.

So, with this type of staining we can certainly see the structure of the cell wall, because those that retain the violet dye even after treatment with a decolorant are gram-positive (many layers of peptodoglycan) and those that easily lose the first dye and take up the second are gram-negative (single layer). It also gives us an idea of the shape and morphology, which when stained will be visible under the microscope.

It also informs us about susceptibility to antibiotics, since some act only on gram-positive bacteria and others only on gram-negative bacteria. For example, gram-positive bacteria are sensitive to beta lactamase/penicillinase and gram-negative bacteria are susceptible to broad-spectrum penicillins such as piperacillin. However, this type of staining will not tell us about the bacteria's ability to process nutrients, because that is not a process related to the structure of the cell wall.

Explain the benefit of higher myoglobin levels for individuals living at high altitudes

Answers

An individual with higher myoglobin levels would be able to carry and store more oxygen in their muscle tissues than a normal person.

In human populations of northern European origin, the disorder called hemochromatosis causes excess iron uptake from food and affects one in 200 adults. Among individuals 15 to 50 years old, men are ten times as likely as women to suffer from iron overload. Part A Taking into account this range of ages, what explains this difference

Answers

Answer:

Females of reproductive age lose iron through menstrual blood

Explanation:

Iron is an essential micronutrient involved in the formation of hemoglobin, myoglobin and many enzymatic groups. Moreover, hemochromatosis is a genetically inherited disorder caused by mutations in genes associated with the processes of absorption, transport and storage of iron. The excess of iron is stored in different organs (e.g., liver, heart, pancreas, etc), causing characteristic tissue damage. During each menstrual cycle, women and girls suffer a blood loss of approximately 40 ml, which is associated with an average loss of 1.6 mg of iron. In consequence, it is expected that women of reproductive age (ie, 15–49 years) lose iron during their menstrual periods, thereby avoiding iron overload caused by hemochromatosis.

In mice, apricot eyes is recessive to black eyes. Tail length is governed by another gene, linked to the eye color gene. Long tails is dominant to short tails. To determine the distance between the two genes, a double heterozygote is mated in a testcross and the classes of progeny produced were as follows:
Apricot eyes, Long tails 33
Apricot eyes, Short tails 20
Black eyes, Long tails 17
Black eyes, Short tails 30
Determine whether the heterozygous parent is in the cis or trans arrangement.
a. Cis
b. Trans

Answers

Answer:

trans

Explanation:

From the given information:

The study observes the genes present in mice for eye color and tail length. Since both genes are linked, it implies that they exist in the same chromosomes.

Black eyes is dominant over apricot eyes

Let Black eye be B and apricot eyes be b

Long tail is dominant over short tail

Let long tail be L and short tail be l

If double heterozygote(homoozygous-recessive) engage in the testcross

Then:

From the result given:

The parental combinations are:

Apricot eyes, Longtail  (bL / bl) =  33

Black eyes, Short tails (Bl / bl) = 30

The recombinant genes are:

Black eyes, Long tails (BL / bl) =  17

Apricot eyes, Short tails (bl / bl) = 20

The recombination frequency relates to the distance between the two genes which can be computed as:

= (20+17)/100

= 37%

Thus; the heterozygous parent is in trans arrangement.

Question 8 of 24
Which item is a carbon sink?
A. Beach sand
B. Ocean water
C. Glaciers
D. Forest fires
SUBMIT

Answers

Answer:

oceans water

Explanation:

fart is big and small and large and tiny so what makes it so powerful?

Answers

Answer:

I think because of his health

Describe a metabolic pathway that is inhibited by the action of a pesticide.

Answers

Explanation:

The mecanism is termed as feedback inhibition.

Explanation:

In an enzyme catalyzed sequential reaction the end product of that reaction inhibits the activity of the activity of the enzyme catalyzing the ist step This type of  regulation is called Feed back regulation or feedback inhibition.

              The main function of human body is to maintain the homeostasis of the all the components it contains.When the end product of an ongoing enzyme catalzsed sequential reaction is produced in a high lebel at that time to maintain its own homeostatis that end product inhibits the functioning of the enzyme catalzsing the ist step of that biochemical reaction.

For Example Cytidine tri phosphate inhibits the activity of aspartate transcarbamoylase catalyzing the de novo biosynthesis pathway of pyrimidine metabolism.

What is an office what is an office ​

Answers

Answer:

Explanation:

An office can be referred to a building or rooms or a room which is arranged and set up with furnitures and things needed for commercial use or professional work to achieve a goal.

An office is also refered to position of authority occupied by someone to perform some tasks.

Answer:

here's your answer

Explanation:

The office helps in controlling the activities of different people and department of an organisation. Through controlling it ensures that the various activities of business are performed with much accuracy. Memory Center: Office protects important information of past in a safe manner.

( Answer the questions using the drop-down menus.


1. Which statement shows the direction of the transfer of heat in this experiment? The heat transfer is from the ( white paper, black paper, light bulb ) to the ( paper, light bulb ) .


2. Which statement compares the temperatures of the white and black sheets at 1, 2, and 3 minute(s)? The temperature ( is higher for the black paper, is higher for the white paper, is the same for both pieces of paper )

3. What conclusion can be made based on this data? ( the black paper absorb less heat. The white paper absorb less heat. The pieces of paper absorb the same amount of heat. ) ​

Answers

Answer:

1. The heat is transferred from the light bulb to the paper.

2. The temperature is higher for the black paper.

3. The white paper absorb less heat.

Explanation:

1. The heat is transferred from the light bulb to the paper.

This is because the light bulb is the source of heat in the experiment. Thus removing the light bulb implies that no heat would flow apart from the ambient heat.

2. The temperature is higher for the black paper.

A black body is a good absorber of heat. So, the temperature of the black paper would be higher compared to that of the white paper.

3. It can be concluded based on this data that: The white paper absorb less heat.

Since white surfaces are good reflectors of heat. Thus the white paper reflects most of the heat from the bulb, while absorbing very little fraction of it.

The pedigree below concerns the autosomal recessive disease phenylketonuria (PKU). The couple marked A and B are contemplating having a baby but are concerned about the baby having PKU. What is the probability of the first child having PKU

Answers

Answer: Hello your question some missing data attached below is the complete question

answer:

P( first child having PKU )  0.25 ≤ x ≤ 0.5

Explanation:

The pedigree father has PKU ( pp ) ( From the top right )

pedigree mother = PP

The possible resultant progeny = Pp  

Resultant progeny marries non-carrier  ( Pp x PP ) = PP , PP, pP, pP

Hence B is either  ; PP ( non carrier ) or Pp ( carrier )

From left

one of the Resultant progeny = pp ( affected ). this simply means pedigree parents where both carriers or sufferers i.e. Pp or pp

Hence A is either ; Pp or pp

The probability of their first child having PKU

= PP x Pp = PP, Pp, PP, Pp ( probability = 0 in this case )

= Pp x Pp = PP, Pp, pP, pp ( probability = 1/4 * 100 = 25% )

= Pp x pp = Pp, Pp, pp, pp ( probability = 2/4 * 100 = 50% )

P( first child having PKU )  0.25 ≤ x ≤ 0.5

lets denote dominant Gene = PP,  recessive Gene = pp

Modelizar un ecosistema colocando los niveles tróficos y las relaciones en la red alimentaria

Answers

Answer:

Ejemplo ecosistema y su cadena trófica:  

- Ecosistema: llanura (campo de maíz)  

- Productor primario: plantas de maíz  

- Consumidor primario: Ratones

- Consumidor secundario: Aves rapaces

- Microorganismo descomponedor: bacterias  

Explanation:

En una cadena trófica o cadena alimentaria de un ecosistema, cada nivel obtiene la energía necesaria para sustentar la vida a partir del nivel inmediatamente anterior, mientras que los productores primarios son aquellos organismos que hacen ingresar la energía al ecosistema. Por otra parte, los descomponedores son organismos que se alimentan de los restos de animales y plantas, mediante su descomposición, obteniendo de ellos energía y materia hasta transformarlos en materia inorgánica. En el ejemplo arriba citado, las plantas de maíz representan los productores primarios los cuales producen energía y materia orgánica requerida para sustentar el ecosistema mediante el proceso de fotosíntesis. En segundo lugar, los ratones, como así también otros organismos herbívoros, representan los consumidores primarios los cuales conforman el segundo nivel trófico de la cadena alimentaria. En tercer lugar, los animales carnívoros que se alimentan de consumidores primarios (como por ejemplo, aves rapaces) representan el tercer nivel trófico, y así sucesivamente niveles superiores en el caso que existan depredadores mayores en el ecosistema. Finalmente, bacterias y otros organismos (por ejemplo, hongos, lombrices, algunos insectos, etc) representan los descomponedores los cuales se alimentan de restos orgánicos en descomposición, transformándolos de este modo en compuestos inorgánicos que ingresan nuevamente al ecosistema.

Question 9
What is the main difference between a prokaryote and eukaryote cell?

Answers:
The presence of a cell wall
The presence of genomic DNA
The absence of genomic DNA
Crossing over
The absence of a cell wall
Question 10

Answers

Answer:

Crossing over

Explanation:

Prokaryotic cells are cells that do not possess a membrane bound nucleus to house their genetic material e.g bacteria while eukaryotic cells possess a membrane bound nucleus that houses their genetic material e.g plants.

One important characteristics of prokaryotic cells is that they do not undergo any form of sexual reproduction, hence, cannot undergo MEIOSIS, which only occurs in sexual reproducing organisms. Prokaryotes reproduce asexually by binary fission.

Crossing over is a unique process that only occurs during meiosis. Since prokaryotic cells do not undergo meiosis, this means that crossing over is the difference between prokaryotic cells and eukaryotic cells in this question.

¿Qué importancia tiene el agua en las reacciones químicas?

Answers

Answer:

El agua es un medio ideal para reacciones químicas, ya que puede almacenar una gran cantidad de calor, es eléctricamente neutral y tiene un pH de 7.0, lo que significa es que no es ácida ni básica. Además, el agua participa en muchas reacciones enzimáticas como agente para romper enlaces o, al eliminar de una molécula, para formar enlaces.

Explanation:

what scenerio in which a population is evolving. Explain how the variants within a population was generated.​

Answers

Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population. ... Genetic variation is advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.

The negative effects of chemical control of weeds on rangelands

Answers

Answer:

Chemical residue remain on the vegetation.

Explanation:

The negative effects of chemical control of weeds on rangelands is that the chemical residue remain on the vegetation in rangeland which is dangerous for animals that feed on vegetation because the chemicals are toxic that cause serious damaged. Sometime the chemical also damaged the  weeds as well as vegetation of rangelands and also kill the beneficial insects that is needed by the plants present in rangelands.

The importance of water properties on plants and animals​

Answers

Question:

The importance of water properties on plants and animals.

Answer:

The importance of water in plants is that it helps plants to make their own food, because water plays a very important role in Photosynthesis, and as well it helps them to grow.

The important of water in animals is that it is main need for animals to survive as well as humans. Without water even a single organism won't exist in this Earth.

Hope it helps you

:)

The human body is made up of more than three-fourths of water, and all animals and plants require water to thrive.

Why water is essential for plants and animals​?

Water is used by all living things to transport nutrients throughout the body and remove waste. Among its many crucial functions, water aids in the digestion of food and the preservation of organisms' heat.

The term "universal solvent" refers to water's enormous capacity to dissolve a wide range of molecules, and it is this capacity that makes water such a priceless life-sustaining agent.

Water's function as a solvent aids cells in the transfer and utilization of molecules like oxygen or nutrients on a biological level.

Therefore, to do all the cellular processes by plants and animals there is need of water.

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Two species of closely related frogs are found in the same pond high in the Andes of South America. Both species only have teeth on the top jaw. One has small teeth for holding small live prey prior to swallowing. The other species has very large sharp teeth for injuring and killing large prey prior to biting off pieces of flesh for consumption. The above is an example of:

Answers

Complete question:

Two species of closely related frogs are found in the same pond high in the Andes of South America. Both species only have teeth on the top jaw. One has small teeth for holding small live prey prior to swallowing. The other species has very large sharp teeth for injuring and killing large prey prior to biting off pieces of flesh for consumption. The above is an example of:

Directional selectionAnalogous structuresCharacter displacementHybridization Vestigial structures

Answer:

Character displacement

Explanation:

Competition is an ecological and evolutive process very common in nature. Competition might be intra- or interspecific. Competition between different species in a community or ecosystem might be due to the same resource use, or the same territory, shelter, etcetera. When a resource is useful for two or more species, and limited, they compete to gain it.

The principle of competitive exclusion states that different species with the same requirements sharing the niche can not coexist indefinitely based on the same limited resource. When two competing species coexist, this is because of niche partitioning or niche differentiation.

Differentiation of effective niche is closely related to character displacement.

Character displacement is the result of interspecific competition, in which two or more species that live in the same habitat manage to avoid competition by developing different traits. Morphological divergence, or any adaptative trait development, fixated genetically, is the product of niche segregation. Species tend to differentiate morphologically in the presence of strong competitors. Traits divergence favors coexistence in the same place.

In the exposed example, both species live in the same pond. But to avoid competition and competitive exclusion, species developed different teeth sizes to feed on different prey items.  


3. In biological terms are you a
producer or a consumer? Explain
your answer.

Answers

Answer:

consumer

Explanation:

because we get things from living things

atoms May bond together to make larger what ​

Answers

Atoms bond together to make larger molecules or elements.

Which product comes from protist

A. Yeast in sourdough bread

B. Mushroom on pizza

C. Cork in bulletin boards

D. Carrageenan in milk

Answers

Answer:

C. The cork in bulletin boards

Explanation:

Cork is made primarily from a plant called Quercus suber (the cork oak).

In the experiment on stimulation of the isolated sciatic nerve, a compound action potential is produced. This represents _______

Answers

Answer: A summed electrical activity of all axons in the nerve

Explanation:

During the experiment with regards to the stimulation of the isolated sciatic nerve, a compound action potential is produced. It should be noted that this represents the summed electrical activity of all axons in the nerve.

Here, the summed electrical activity of all axons in the nerve represents the sum of the potentials that were recruited in the experiment.

What measurements are in the si system

Answers

Answer:

Length - meter (m)

Time - second (s)

Amount of substance - mole (mole)

Electric current - ampere (A)

Temperature - kelvin (K)

Luminous intensity - candela (cd)

Mass - kilogram (kg)

Explanation: in the chart above are the measurements in the si system.

Using the organisms you identified in part B, create a food web for the ecosystem you chose. Use this sample food web for reference, although your food web will contain fewer organisms. Note that your food web does not have to include images, but you may include them if you choose. However, be sure to include arrows to indicate the direction of energy flow in your food web. Design your food web using any method listed below:

Answers

Unfortunately you did not introduce the organisms identified in part B, as the question shows. This makes it impossible for me to answer this question, but I will try and help as best I can.

In the figure attached to the question below, it is possible to see an example of a food web and the arrows that indicate the direction of the energy flow within this food web.

In this sense, we can determine that a food web is the set of food chains that complete and mix. A food chain shows how living organisms organize themselves so that one feeds on the other, whereas in the food web, this food chain is shown in a more realistic way, as it shows how food chains mix and interact within the ecosystem, as they do not there are food chains isolated in nature.

Answer:

I did Lake Tahoe. Feel free to use this image!

Explanation:

A human cell with an unknown type has 23 chromosomes. Which of the following types of cells can the unknown be?
Skin cell
Sperm cell
Cardiac cell
Intestinal cell

Answers

Answer:

cardiac cell

Explanation:

A human cell with 23 chromosomes is sperm cell.

What is cell?"A cell is the structural and functional unit of life."A cell has specialised structures called organelles which perform various functions.Nucleus is an organelle which has a thread like structure called chromatin fibres which condenses to form chromosomes.What is chromosome?Chromosomes (made up of thin chromatin fibre) contains genes which is a heredity unit (carry genetic information from parents to offspring).Human has 23 pairs of chromosomes (total 46 chromosomes) in all of its cell except for the s ex cell, which is haploid i.e., only 23 chromosomes is present.Male s ex cell is called sperm cell and female s ex cell is called egg cell each havin 23 chromosomes.

Hence, the correct answer is: Sperm cell.

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In the experiment on stimulation of the isolated sciatic nerve, the compound action potential increases in amplitude with an increase in stimulation voltage. This is due to:__________.
a. simultaneous recruitment of small and large diameter axons in the nerve
b. recruitment of small diameter axons followed by large diameter axons in the nerve
c. increase in the size of action potentials produced be each individual axon in the nerve
d. recruitment of large diameter axons followed by small diameter axons in the nerve

Answers

B is the correct answer your welcome

The compound action potential increases in amplitude with an increase in stimulation voltage is due to recruitment of small diameter axons followed by large diameter axons in the nerve.

what is axons?

The part of a nerve cell (neuron) that transports nerve impulses away from the cell body is known as an axon. A neuron has one axon that connects it to other neurons, muscle cells, and gland cells.

What is compound action potential?

Compound action potential measurement capabilities are built into cochlear implants and are used as objective measures during device setup and programming. Because the stimulus recruits many fibers simultaneously and synchronously, the response is called a compound action potential because it is the sum of the many potentials recruited.

The amplitude of the reaction is increased via summation and synchronous production, making detection possible. A variety of diagnostic methods include recording the electrical activity of peripheral nerve neurons. A second deflection will emerge in the displayed waveform when we gradually increase the stimulus voltage using the control knob on the stimulator.

hence, the correct answer is B.

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g 20. Name two bones connected by an interosseous membrane found in the crus and/or sural region. Which one is the medial bone

Answers

Answer:

Tibia and fibula. Tibia (medial bone)

Explanation:

The tibia is the medial bone of the lower leg (it is the second-largest bone next to the femur), whereas the fibula is the lateral bone of the lower leg. The tibia functions to transmit the majority of the force in the lower leg. The tibia articulates at the proximal end with the femur and fibula; where this bone (tibia) articulates at the distal end with the fibula and the talus bone of the ankle. The tibia and fibula are connected via an interosseous membrane, which is a thin sheet of connective tissue that spans the space between two bones.

Classify the receptor descriptions or names below based on which neurotransmitter each is associated with. alpha-Adrenergic beta-Adrenergic Muscarinic Nicotinic Only receptor found in parasympathetic synapses Associated with mushroom poison Ultilizes calcium ions as a second messenger Associated with tobacco Norepinephrine Acetylcholine Reset

Answers

Answer:

1. Acetylcholine:  

- Muscarinic  

- Nicotinic  

- Associated with mushroom poison  

- Only receptor found in parasympathetic synapses  

- Associated with tobacco  

2. Norepinephrine:  

- alpha-Adrenergic  

- beta-Adrenergic

- Utilizes calcium ions as a second messenger

Explanation:

Acetylcholine (ACh) is a neurotransmitter that acts in both the central and peripheral nervous systems. Cholinergic receptors are receptors that bind to ACh. Muscarinic receptors are G protein-coupled receptors involved in the parasympathetic nervous system, which play roles in a variety of physiological responses (e.g., ACh binds to muscarinic receptors in the pathophysiology of asthma, leading to an increased mucus secretion). Nicotinic receptors bind to nicotine, while muscarinic receptors bind to muscarin (muscarine is a well-known neurotoxic alkaloid found in certain mushrooms). Nicotine receptors are also called cholinergic receptors since they also respond to ACh.  On the other hand, norepinephrine (NE) binds to alpha-adrenergic and beta-adrenergic receptors in different tissues. Both alpha-adrenergic and beta-adrenergic receptors are G-protein coupled receptors. Alpha-adrenergic receptors are involved in the regulation of blood pressure and generating a sympathetic 'fight and flight response'; whereas beta-adrenergic receptors modulate sympathetic responses in the cardiovascular, metabolic, and central nervous systems (NE activates the beta1-receptor). NE can induce Ca2+ release, which is a second messenger that controls a wide variety of cellular processes.

How is it possible for mad made things to move?

Answers

How is it possible for mad made things to move?Answer: Because the human body is designed to use their muscles to create and transfer things from place to place, and that some man-made objects are light enough to be moved
Other Questions
A 100 kg man is one fourth of the way up a 4.0 m ladder that is resting against a smooth, frictionless wall. The ladder has mass 25 kg and makes an angle of 56 degrees with the ground. What is the magnitude of the force of the wall on the ladder at the point of contact, if this force acts perpendicular to the wall and points away from the wall Solve for n. 1/ n-4 - 2/n = 3/ 4 - n Which of the following sentences shows an adverb modifying an adjective?A. The pancakes at this diner are simply the best!B. She softly whispered her secret so no one could hear.C. We hold this party annually.D. He very happily accepted the position.Reset Selection Dan's cat Empurrium is planning for the new opening in either Seattle, Everett or Bellevue! Using historical data from the first location, management has determined that over a 9 hour workday, on average we get a steady stream of customers throughout the day totaling 1,033 per day. Our new training program ensures that our staff can serve a customer within 2.7 minutes on average. a. Your hiring department wants to know what the lowest number of staff we should hire.b. How your queue should be set up in the new store and why? This should include the style of line and the number of servers. Justify your decisions using costs and queueing metrics? 13. About how many teen drivers were killed in motor vehicle crahes in theUnited States over the past decade? The number of grams of helium in a balloon at a pressure of 99.8 kPa, a temperature of 301 K, and a volume of 0.785 L would beOptions:814 g0.125 g0.278 g337 g A dripping tap loses water at a rate of 5mL a minute. How long does it take to lose one litre? Can someone help me with this? ILL MARL BRAINIEST IF YOU DO THIS CORRECTLY!!! Drag each tile to the correct box.Order the expressions from least value to greatest value. 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Lan________ learning English a few years ago.A. starts B. will start C. started D. is starting30. Only after she________from a severe illness did she realize the importance of good health.A. would recover B. has recoveredC. had recovered D. was recovering31. Only after the bus________for a few miles did Jane realize she was on the wrong route.A. was running B. had run C. has run D. runs32. The children________to bed before their parents came home from work.A. were all going B. had all gone C. had all been going D. have all gone33. Paul noticed a job advertisement while he________along the street.A. was walking B. would walk C. walked D. had walked34. I havent met him again since we________school ten years ago.A. have left B. leave C. left D. had left35. For the last 20 years, we________significant changes in the world of science and technology.A. witness B. have witnessed C. witnessed D. are witnessing36. My best friend Lan________to England 10 years ago.A. was moving B. moves C. moved D. has moved37. Mr.Pike________for this company for more than thirty years, and he intends to stay here until he________.A. worked/retires B. works/is retiringC. has been working/retires D. is working/will retire38. While I________at the bus stop, three buses went by in the opposite direction.A. was waiting B. waited C. had waited D. were waiting39. By the end of last March, I________English for five years.A. had been studied B. had been studyingC. will have been studying D. will have studied40. ________Alan for hours but he hasnt answered his mobile. I hope nothings wrong.A. I call B. Ive been calling C. Im calling D. called41. We________in silence when he suddenly________me to help him.A. walked - was asking B. were walking - askedC. were walking - was asking D. walked - asked42. By the time the software________on sale next month, the company________$2 million on developing it.A. went - had spent B. will go - has spentC. has gone - will spend D. goes - will have spent43. When Carol________last night, I________my favorite show on television.A. called /was watching B. had called /watchedC. called /have watched D. was calling /watched44. Linda took great photos of butterflies while she________in the forest.A. was hiking B. is hiking C. hiked D. had hiked45. When I________for my sister in front of the supermarket, a strange man came to talk with me.A. was waiting B. waited C. had waited D. were waiting46. Over the past 30 years, the average robot price________by half in real terms, and even further relative to labor costs.A. is fallen B. has fallen C. were fallen D. have fallen47. When I came to visit her last night, she________a bath.A. is having B. was having C. has had D. had had48. John________in the same house since he left school.A. lived B. had lived C. was living D. has lived49. Since Tom________, I have heard nothing from him.A. had left B. left C. has left D. was left50. He will take the dog out for a walk as soon as he _______ dinner.A. finish B. has finished C. will finish D. finished Hey can anyone help me pls Will Mark Brainlest Helppp please I need help I don't understand this at all. nasa's voyager 1 rocket was able travel 1.224 x 10^5 kilometers in two hours. what is its average speed in kilometers per second?6.12 km per sec10.2 km per sec17 km per sec61,200 km per sec PLEASE HELP!!! Find the value of x.A. 11B. 5C. 25D. 31 Find the common ratio for the geometric sequence