Answer:
The force of friction between the two surfaces will increase if the two surfaces are pressed harder against each other. Heavy box will press the floor surface harder as compared to the lighter box. That means the force of friction will be more between the heavier box and surface than between the lighter box and surface. Thus, larger force will be needed to push the heavier box than to push the lighter one.
White blood cells work by recognizing invading pathogens by their surface fragments, called __________.
Answer:
white blood cells that systematically envelop and kill pathogens such as bacteria, viruses, and fungi, worn-out body cells, and cells that have become cancerous. their surface fragments, called antigens, literally antibody generators.
Explanation:
.Discuss the THREE types of evidences of evolution to show that all organisms are related to each other: fossil record, comparative anatomy, AND molecular evidence. ALSO, give an example of each.
Answer:
1. fossil record:
Fossils are organisms that get buried in sedimentary rocks. These are formed at different times. The study of fossils existing in the different rock layers indicates the time period when they existed. Thus different life forms have been formed at different times in the history of the earth.
fossil bird Archaeopteryx is considered as a connecting link between reptiles and birds indicating that birds evolved from reptiles.
2 comparative anatomy:
Homologous organs - such organs that have different embryonic origins but play different roles.
The forelimbs of whale, bat, deer, rabbit
Homologous organs - such organs that are the same in structure and embryonic origin but play similar roles.
wings of a bird and wings of the insect. The wings of the birds are modified
3. DNA sequence can be helpful in finding relations among organisms. Biogeography also helps in identifying the geographical distribution of organisms, to know how and when species may have evolved.
what a meteor is called before it enters Earth’s atmosphere
Answer:
A meteor, before entering earth's atmosphere is known as a meteoroid
someone help.......................................what are the economic importance of bacteria
Answer:
me
Explanation:
bcox help finish come me
Genetic drift in a population affects the gene pool in which of the following ways?
decrease in genetic variation
increase in genetic variation
increased in mutations
decreased in gene flow
Answer:
Sometimes, there can be random fluctuations in the numbers of alleles in a population. These changes in relative allele frequency, called genetic drift, can either increase or decrease by chance over time. ... Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool.
Genetic drift in a population affects the gene pool by decreasing genetic variation.
What is genetic drift?Genetic drift is a mechanism of evolution that occurs due to random fluctuations in the frequency of alleles (alternative forms of a gene) in a population. It refers to the random changes in the frequency of alleles that occur by chance alone, rather than through natural selection or other selective pressures.
Genetic drift is more likely to occur in smaller populations, where chance events can have a greater impact on the frequency of alleles. The effects of genetic drift can result in the loss of certain alleles from a population over time, or the fixation of one allele in a population, meaning that it becomes the only allele present at that particular gene locus.
Two forms of genetic drift are bottleneck effect and founder effect. In the bottleneck effect, a sudden reduction in population size can cause the loss of genetic diversity, while in the founder effect, a small group of individuals colonizes a new area, leading to the establishment of a new population with a limited subset of the genetic diversity present in the original population.
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5. A typical incandescent light bulb produces
A.an absorption spectrum
B.a discontinuous spectrum
C.a continuous spectrum
D.an emission spectrum
What is a technique that aims to reduce viable spoilage microorganisms so they are unlikely to cause disease?
Answer:
Pasteurization
Explanation:
Food products such as milk, wine and beverages may be subjected or placed on a heat treatment process with the aim of reducing active microorganisms present in them. This will improve the quality of food materials and also prolong its life span. This heat treatment process help destroy pathogenic microorganisms and those which are responsible for food spoilage. Once this food spoilage microorganisms are destroyed, the good products will have enhanced or prolonged life span of the food product and also reduces their risk of causing disease.
fungsi vakuol mengecut dalam paramecium
Carbohydrates are organic compounds containing chemical bonds used to power cellular processes. Sources of carbohydrates include: (select all that apply)
Answer:
Bread, beans, milk, popcorn, potatoes, cookies, spaghetti, soft drinks and corn etc.
Explanation:
Bread, beans, milk, popcorn, potatoes, cookies, spaghetti, soft drinks and corn etc are the main sources of carbohydrates. In these foods, carbohydrates are present in large amount which is a quick source of energy for us. The breakdown of carbohydrates starts from the mouth when the food mixes with saliva which contains an enzyme that starts breakdown of carbohydrates into micromolecules is called glucose that can be absorbed by our body for the production of ATP molecules.
Explain the evolution of altruism.
Answer:
Altruistic behavior, such as sterile worker ants caring for the offspring of their queen, evolves only between related individuals through what is known as kin selection — or so many evolutionary biologists have thought since the 1960s.
What are the characteristics of annelidas
Answer:- They are coelemate
-The body is covered with thin curticle
-They are triploblastic
-The have long and segment bodies
-Annelidas are bilaterally symmetrical
The total number of molecules of ATP produced during glycolysis is ______, which results in a net production of _____ ATP.
Answer:
The answer is "4 and 2 ".
Explanation:
The overall glycolysis ATP number is 4 of one hydroxyl group. In the first part of the glycolysis 2 ATP molecules are used, so that 2 ATP molecules are net gained. 2. In addition, 2 NADH atoms in the glycol are also created. This is why the total ATP molecules produced during metabolism are 4, resulting in a net output of 2 ATP.
characteristics of carbohydrates
Answer:
they are quickly used by the body, and are typically quick source of energy. They can be found in almost all sort of food. The composition of Carbohydrates are consisted of Carbon, Hydrogen, and Oxygen.
Difference between plants in a tropical location, a temperate location, or the tundra?
Answer:
a tropical location as an area near the equator a temperate location is any area that that lies between the tropical and polar zones and a tundra is the coldest of all the biomes. Tundra comes from the Finnish word tunturi, meaning treeless plain. It is noted for its frost-molded landscapes, extremely low temperatures, little precipitation, poor nutrients, and short growing seasons.
Mammals are a large group of animals that includes humans, apes, dolphins, bears, bats, cats, and much more. Which statement can be made about this information? All mammals use echolocation to find food. Some mammals use echolocation to avoid obstacles. All mammals use walking as their primary means of transportation. Some mammals need to find food to survive.
Answer: B
Explanation:
Just did the test
The statement that can be made about the information is: "Some mammals need to find food to survive."
What are Mammals?Mammals are a diverse group of animals that are found all over the world and come in many different shapes, sizes, and types.
All mammals share certain key characteristics, including the fact that they are warm-blooded, have hair or fur, and feed their young with milk produced by their mammary glands.
While the information given in the first sentence provides a list of mammals, it does not provide any information about their specific behaviors or characteristics, such as the use of echolocation or means of transportation.
However, the statement that "some mammals need to find food to survive" is true for all mammals, as food is a basic necessity for the survival of all members of this animal group.
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Blood banks dispose of blood that has low levels of bisphosphoglycerate. What would be the probable reason for doing so
Answer:
Erythrocytes low in BPG does not unload O2 very well.
Eukaryotes have three nuclear RNA polymerases. The primary function of RNA polymerase II is transcription of _____.
Answer: the answer is protein-coding genes
(if this is right mark brainliest :))
Eukaryotes have three nuclear RNA polymerases. The primary function of RNA polymerase II is transcription of protein coding genes
what are the function of RNA polymerase ?there are Three different types of RNA polymerases (RNAPs), which transcribe eukaryotic genes, such as RRNA genes are transcribed by RNA polymerase I.
mRNA, miRNA, snRNA, and snoRNA genes are mainly transcribed by RNA polymerase II, while tRNA and 5S rRNA genes are transcribed by RNA polymerase III.
short RNAs as well as the protein coding genes are both transcribed by RNA polymerase II.
A Separate type of RNA polymerases are present in chloroplasts and mitochondria, where they specifically transcribe the DNAs of those organelles.
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Someone, please help!
Answer:
Step 2: The right ventricle pumps the oxygen poor blood to the lungs via pulmonary valve. Step 3: The left atrium receives oxygen -rich blood and pumps it to the left ventricle. Step 4: The left ventricle pumps the oxygen-rich blood via aortic valve, submitting this blood through the entire body.
Explanation:
Use this website if you need more information. Good luck.
https://wa.kaiserpermanente.org/kbase/topic.jhtml?docId=tx4097abc
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What is the definition of specific heat capacity?
O A. The amount of heat required to break the chemical bonds in 1 g of
a substance
B. The amount of heat required to form 1 g of a substance from its
elements
C. The amount of heat required for 1 g of a substance to undergo a
phase change
D. The amount of heat required to raise the temperature of 1 g of a
substance by 1°C
Option D is the correct option..
D. The amount of heat required to raise the temperature of 1 g of a
substance by 1°C
explain why adrenaline has opposite effects on the blood vessels of the gut and the muscles
Answer:
Main effects of adrenaline exerted on smaller arterioles and precapillary sphincters although veins and large arteries also respond to the drug. It constricts vessels of skin & mucus (mucous) membrane. It dilates BV of skeletal muscles. Thus net results of this is, decrease in the peripheral resistance.
Explanation:
HOPE IT HELPS
Answer:
adreneline triggers the body's fight or flight response.this reaction causes air passages to dilate to provide muscles with oxygen they need to fight danger or flee
It takes about [?] hours for food to be
ingested, digested, and leave the small
intestine.
A. 8
B. 1-2
C. 24
D. 5.
Answer:
A 6 to 8 hours. After you eat it takes about 6 to 8 hours for food to pass through your stomach and small intestine.
The process where animals take in oxygen to breakdown energy from the plants is
a) breathing
b) photosynthesis
c) aerobic respiration
d) digestion
The villi of the small intestine Group of answer choices provide an enormous surface area that facilitates absorption. store fat-soluble vitamins. continuously push food through the small intestine to the colon. inactivate enzymes consumed with food.
Answer:
Provide an enormous surface area that facilitates absorption.
Explanation:
The villi of the small intestine provides an enormous surface area that facilitates absorption of nutrients from the small intestine. The cells present on the villi are packed full of tiny hair-like structures called microvilli. It performs the same function as villi perform in the small intestine i.e. absorb nutrients. Villi are surrounded with cells that help in the absorption of nutrients from the food that passes through it.
urine is made of _________
Answer:
Answer is A
Explanation:
Urea consists of carbon, nitrogen and oxygen. You can find it in urine, sweat, blood and milk in mammals. In its most concentrated form, it is urine. Urea is a crystalline compound, and the nitrogen content is always at least 46 percent when dry.
A population of birds lives on a small island. Another population of the same species lives on the mainland. The
distance between the island and the mainland is too great for birds to fly back and forth. Recently, a series of
sandbars and tiny islands have formed between the island and the mainland.
Answer:
The birds can now reach the Island.
Explanation:
The birds can now reach the Island because there is a sandbars and tiny Islands where they can rest for sometime as well as feed on the insects present at that sandbars and tiny Islands. Before these sandbars and tiny islands, the birds can't reach to the mainland due to large distance between Island and mainland so they have no capability to fly such large distance until the tiny Island and sandbars are appeared in the ocean.
Answer: an increase in gene flow between the bird populations
Explanation: :)
Describe the sliding filament model of muscle contraction. What role do acetylcholine and acetylcholinesterase play in muscle contractions
Answer:
It Is me the Explanation Wizard (づ｡◕‿‿◕｡)づ
Explanation:
Hey (☞ﾟ∀ﾟ)☞ It's the Explanation Wizard here for your troubles I don't wanna waste time so here is my answer+explanation that I have personally wrote for you.The first question you asked here's the a+e The sliding filament model describes the process used by muscles to contract. It is a cycle of repetitive events that causes actin and myosin myofilaments to slide over each other, contracting the sarcomere and generating tension in the muscle. second a+e for second question When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. That starts a chemical reaction within the muscle. Explanation Wizard out
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Match each organelle with the main life function(s) it helps the cell perform. Each basic function of life can be used more
than once, and many organelles will have more than one possible answer. Choose one answer only,
Organelle list - nucleus, mitochondria, golgi apparatus, endoplasmic reticulum, ribosomes, lysosomes, vacuoles, cell membrane, chloroplast, cell wall
The answer could either be 1. reproduction 2. interaction with the environment 3. growth 4. uses energy 5. waste production (each function can be used more than once)
Answer:
The correct answer is -
nucleus - reproduction, mitochondria- reproduction, golgi apparatus - waste production, endoplasmic reticulum - growth, ribosomes - growth, lysosomes- waste production, vacuoles - growth, cell membrane - interaction with the environment, chloroplast - uses energy, cell wall - interaction with the environment
Explanation:
A Cell has various organelles with more than one generic function such as the nucleus not just play role in cell reproduction but also plays role in regulating other organelle and cell growth by transcription. Mitochondria produces and provides energy for many functions such as growth, reproduction and substance transport.
Golgi apparatus package proteins and wastes to transfer them out of the cell. The ndoplasmic reticulum modifies the protein produced by ribosomes and helps in growth of the cell. Lysosomes digest waste and cell debris by lysosomal vesicles. Cell membrane and cell wall interact with outer environement.
True or false: Cellular microbes are often arranged in multicellular complexes with differentiated tissues.
Answer:
False
Explanation:
A system of farming that leads to continuous destruction of virgin forest is
A. mixed farming
B. mixed cropping
C. pastoral farming
D. shifting farming
Answer:
shifting farming
Explanation:
this process of farming doesn't allow the forest regenerate ergo destroys it ..
Organisms use glucose to store and transport energy.
True
False
Answer:
Glucose and ATP are used for energy by nearly all living things. Glucose is used to store and transport energy, and ATP is used to power life processes inside cells. Many autotrophs make food through the process of photosynthesis, in which light energy from the sun is changed to chemical energy that is stored in glucose.
Explanation:
Most organisms use glucose and ATP for energy. ATP powers cells, and glucose stores and transports energy. Photosynthesis converts sunlight into glucose for many autotrophs.
What do organisms use to store and transport energy?All living things use ATP and glucose as energy sources. Energy is stored and transported by glucose, and cellular life functions are powered by ATP. Through the process of photosynthesis, which converts solar light energy into chemical energy that is stored in glucose, many autotrophs produce food.
Glycogen is the name given to this form of glucose that is stored and is composed of several linked glucose molecules. Glycogen is broken down to release glucose into the bloodstream, which is then used as fuel for the cells, when the body needs a sudden surge of energy or when the body isn't obtaining glucose from food.
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