Answer: C. Animal butchery for the first time
Explanation: The discoveries in the cave suggest that humans were harvesting food from the sea (including shellfish and other marine resourses), the use of complex small stone tools and using red pigments in symbolic behavior 164,000 years ago.
A paleoanthropologist (with the Institute of Human Origins at Arizona State University); Curtis Marean, who was the Lead of the research team expressed the aforementioned discoveries while presenting their reports on the research.
He further indicate that these discoveries translates that humans must have been living along this coastal environment at that early time while exploiting it resourses.
What is the ethical dilemma associated with randomized controlled studies for suspected causes of disease such as cigarette smoking?
a. The prevalence of disease within the study cannot be controlled.
b. The effect of the disease is too detrimental to the health of those involved within the study to allow them to be voluntarily exposed to a suspected cause of disease.
c. Incidence of disease is often determined to be too low to conduct a randomized controlled trial.
d. It is difficult to establish definitive contributory cause even with a high-quality randomized controlled trial.
Answer:
b. The effect of the disease is too detrimental to the health of those involved within the study to allow them to be voluntarily exposed to a suspected cause of disease.
Explanation:
Randomized controlled studies assess the relationship between cause and effect. There are usually two groups in this study. The first group is the experimental group which is exposed to the treatment or intervention to be assessed while the second group is the control group which is given no treatment or given a placebo.
As it relates to the question, the experimental group is exposed to cigarettes to determine the effect of this exposure. This can have an adverse health effect on the experimental group, hence, this is an ethical dilemma.
plz help
and explain why?
Answer:
steel plate
Explanation:
steel plate have lustre because steel is coated with zinc.
Hope it is helpful....what precautions should you take to avoid exposure to blood borne pathogens
Explanation:
The Bloodborne Pathogens standard (29 CFR 1910.1030) and CDC's recommended standard precautions both include personal protective equipment, such as gloves, gowns, masks, eye protection (e.g., goggles), and face shields, to protect workers from exposure to infectious diseases.
Answer:
The Bloodborne Pathogens standard (29 CFR 1910.1030) and CDC's recommended standard precautions both include personal protective equipment, such as gloves, gowns, masks, eye protection (e.g., goggles), and face shields, to protect workers from exposure to infectious diseases.
The predominant forms of actin inside a cell are ATP-G-actin and ADP-F actin. What would be the consequence for actin filament assembly/disassembly if a mutation prevented actin's ability to bind ATP
Answer:
If actin is unable to bind to the ATP molecule, it will not be able to assemble into its two dominant forms.
Explanation:
As shown in the question above, the two predominant forms of actin are ATP-G-actin and ADP-F actin. As we can see, the formation of these two molecules involves the presence of an ATP molecule, in which case, the concentration of actin inside an organism depends totally on the capacity of the actin to be able to bind to an ATP molecule. If there is a mutation that prevents this binding from occurring, actin will not be able to form its two dominant forms, which will harm the presence of actin in the body.
If you took a sample of magnetotactic bacteria from the northern hemisphere to the southern hemisphere, would you expect them to survive
Answer:
Yes.
Explanation:
Yes, magnetotactic bacteria can survive in the southern hemisphere if the suitable environment is available for them. These bacteria requires freshwater and marine habitats and prefer environments that contain little to no oxygen means anaerobic conditions. This type of environment is also present in the southern hemisphere so we can conclude that this bacteria can survive in that environment.
Which of the following is a part of male gamete formation, but not a part of female gamete formation? testes ovaries germ cells oogonia
Answer:
A. Testes
Explanation:
I got it right on the test
Answer:
A Testes
Explanation:
I got it right on Edgenutity 2021
The organisms in Kingdom Monera do not have complete cell. They are called ____________.
A. autotrophs
B. Prokaryotic
C. Eukaryotic
D. Heterotrophs
Answer:
The correct answer is - A. prokaryotic.
Explanation:
Monera is the kingdom that has not complete cell organization as eukaryotic cells and shows similar cell organization like prokaryotic cells with no clear nuclear membrane and a unicellular body.
The true bacteria and cyanobacteria are the member of this group. The nature of the organisms is either autotrophic or heterotrophic. Thus, the correct answer is - prokaryotic.
The organisms in Kingdom Monera do not have complete cell. They are called
B. prokaryotic
Write the name of the nutrients present in each of these food items. eggs bread fruits fish milk chocolates oil potatoes
Answer:
what your Question
Explanation:
ueueueueuueueue
•Based on cellular respiration, why does cardiac arrest (heart stops beating) decrease brain activity? Hint: think about what happens in the absence of blood flow and oxygen levels.
Answer:
the heart stops pumping as much blood to the brain which will lower the amount of funtion.
6. The thin delicate membrane just attached to the cytoplasm is: [MOE 2061] (a) Ectoplasm (b) Endoplasm (c) Tonoplast (d) Protoplasm
Answer:
cell membrane
Explanation:
The answer is, cell membrane.
What is the thin and delicate membrane around the cell?Cellular membrane A delicate, thin membrane known as the cell membrane surrounds every cell. Lipids and proteins make up its composition. It is composed structurally of protein layers on either side of bimolecular phospholipid layers.What is cytoplasm and Endoplasm?In general, endoplasm refers to the inner, thick (often granular) portion of the cytoplasm of a cell. The ectoplasm, which is the outer (non-granulated) layer of the cytoplasm and is ordinarily watery and located next to the plasma membrane, is in contrast to this.What is endoplasm and its function?Large and active, the endoplasmic reticulum (ER) plays a variety of functions in the cell, including calcium storage, protein synthesis, and lipid metabolism. Different domains, which are composed of tubules, sheets, and the nuclear envelope, carry out the various ER activities.
Learn more about endoplasm here:
https://brainly.com/question/520598
#SPJ2
1. Explain the relationship between the terms species and organism.
Answer:
Organism: An individual living thing
Species: A group of any given organism; a group of many individual living things
A species is defined as the group of organisms in which individuals can reproduce their progeny.
What is Species?A species is defined as the basic unit of classification. This is also taxonomic rank of an organism, as well as a unit of biodiversity. These are the group of organisms which can reproduce with one another in nature and produce fertile offspring.
Species can be divided further on the basis of concept like
1. Typological or Essentialist Species Concept
2. Nominalistic Species Concept
3. Biological Species Concept
4. Evolutionary Species Concept
The species designation which originated in taxonomy, where the species is the basic unit of taxonomy is recognized by the International Commission on Zoological Nomenclature. Every species is have a standard two-part name of genus and species.
Thus, a species is defined as the group of organisms in which individuals can reproduce their progeny.
Learn more about Species, here:
https://brainly.com/question/13258090
#SPJ2
First, you introduce to the parents the importance of karyotype test, by describing its ability to detect two broad categories of abnormalities in chromosomes, (1)______________________ and (2)_______________________. You provide a few examples of genetic disorders that can be caused by chromosomal abnormalities, such as (3)_________________________ and (4)_____________________. Some parents would like to know what is the main cause of these genetic disorders. Without going into too much detail, you explain to them that chromosomal abnormalities are usually caused by (5) ____________________ in meiosis I and meiosis II, when the homologous chromosomes or sister chromatids fail to separate during meiotic cell division.
Answer:
Abnormalities in Chromosomes
1. Numerical
2. Structural
3. Down Syndrome
4. Turner Syndrome
5. Disorder or Error
Explanation:
Numerical chromosome abnormalities occur due to extra or missing chromosomes. Structural chromosome abnormalities occur due to the irregular formation or rearrangement of the chromosomal DNA, normally called translocation. Down syndrome occurs with extra chromosomes, more than 46. Turnover syndrome results from partial or missing X chromosomes, less than 46.
ii) Explain briefly how these features contribute to the efficiency of photosynthesis?
Answer:
here's your answer
Explanation:
the estimated maximum energy efficiency of photosynthesis is the energy stored per mole of oxygen evolved, 117/450, or 26 percent.
Consequently, plants can at best absorb only about 34 percent of the incident sunlight. The actual percentage of solar energy stored by plants is much less than the maximum energy efficiency of photosynthesis. An agricultural crop in which the biomass (total dry weight) stores as much as 1 percent of total solar energy received on an annual areawide basis is exceptional, although a few cases of higher yields (perhaps as much as 3.5 percent in sugarcane) have been reported. There are several reasons for this difference between the predicted maximum efficiency of photosynthesis and the actual energy stored in biomass. First, more than half of the incident sunlight is composed of wavelengths too long to be absorbed, and some of the remainder is reflected or lost to the leaves
Which explains why this is the case
Answer:
i dont know cause the question is missing
Explanation:
what is the function of the liver?
Answer:
The Liver Stores Glycogen and Vitamins.
Its helps in Excreting Bilirubin which is produced from the breakdown of Red Blood Cell(RBC).
It also helps In the Production of Bile(This is stored in the gall bladder).
Which way do the chlorophyll bands move on the chromatography paper?
Answer:
They move up the chromatography paper.
Because the movement of the chlorophyll bands on the chromatography paper is dependent on the stationary phase and the mobile phase, the pigment separates different colors when moving the top of the paper.
What is the significance of chromatography?Chromatography is a technique that is used to separate and analyze a mixture of chemical substances and is a powerful tool in various fields such as chemistry and biochemistry. The significance of chromatography is that it allows scientists to identify and quantify individual components in a mixture and these techniques are helpful for the synthesis of drugs and other chemical products.
Hence, because the movement of the chlorophyll bands on the chromatography paper is dependent on the stationary phase and the mobile phase, the pigment separates different colors when moving the top of the paper.
Learn more about chromatography here.
https://brainly.com/question/26491567
#SPJ6
Please help!! Answers!!! I Need The Right Answer!! A group of scientists studied the environmental impact of internal combustion engines burning hydrocarbon fuels. The scientists equipped four vehicles with devices to capture and measure particulate emissions. One vehicle burned diesel fuel, one burned ordinary gasoline, one burned a gasoline/ethanol mixture, and one burned natural gas. The four vehicles had equal masses and carried identical cargo. The scientists drove each vehicle 400 kilometers, recording the volume of fuel burned and the quantity of particulate emissions generated.
What is the independent variable in this experiment?
A.
type of fuel
B.
distance traveled
C.
mass of vehicle and cargo
D.
quantity of particulate emissions
Answer:
A. type of fuel
Explanation:
The scientists combusted different types of hydrocarbons (different type of fuel)
Solutions having osmotic pressures more than those of body fluids are called Group of answer choices hyposmotic. neosmotic. hyperosmotic. magnosmotic. isosmotic.
Answer:
hyperosmotic
Explanation:
Osmosis across a membrane occurs in nature as a result of concentration gradient i.e. difference in the solute concentration. Based on the concentration of solute in a solution which determines the osmotic pressure, a solution can either be hyperosmotic, hypoosmotic or isosmotic.
A hyperosmotic solution is that solution which contains more solute concentration in relation to another solution. In essence, a hyperosmotic solution will have more osmotic pressure than that of the body fluid. This will cause water to flow out of the body into the solution.
define cell and atom
Answer:
Cell is made of molecules whereas atoms make up molecules. Cells are the smallest functioning unit in a living organism.
Atom is the smallest unit of matter. Usually, a cell is on the micrometer scale while an atom is in the angstrom scale .
OAmalOHopeO
The membrane potential that occurs when neurotransmitters bind to their receptors is called _______.
Answer:
action potential
Explanation:
Transmission of a signal within a neuron (from dendrite to axon terminal) is carried by a brief reversal of the resting membrane potential called an action potential. When neurotransmitter molecules bind to receptors located on a neuron's dendrites, ion channels open.
Answer:
I guess action potential is the correct one
Read the paragraph below to answer the question.
This event was of great significance to modern Chinese history. The monarchial system was
discarded with the founding of the provincial government of the Republic of China. The
victory was soon compromised by concessions on the part of the Chinese bourgeoisie, and
the country entered a period dominated by the Northern Warlords, headed by Yuan Shikai.
(1 mark)
What event is described above and in which year did it happen?
(2 marks)
Answer: 2
Explanation:
PLEASE BE QUICK! Question 7 of 35
Why do scientists use microscopes to study cells?
A. Because most cells are too dangerous to view without protection
B. Because it is quite rare to find living things that are made of cells
C. Because most cells cannot be seen without magnification
D. Because cells can be studied only after they have died
SUBMIT
Answer:
C
Explanation:
Most are too small to be seen with the naked eye. so they must be looked at with a microscope
The answer is C) Because most cells cannot be seen without magnification
Without the proper tools, the naked eye will never be able to see a cell. But when you have the correct tools, you will be able to spot them, as long if you know what you are doing. Cells are too small for the naked eye to see, just like trying to find the needle in the haystack without touching it.
Scientists think that red pandas and raccoons share a more recent common
ancestor than red pandas and giant pandas do. If this is true, what would you
expect to be true about the genetic sequences in these organisms?
O A. Red pandas and raccoons must have identical DNA sequences.
B. The DNA sequences of giant pandas are likely to be more similar
to the sequences of raccoons than of red pandas.
C. Red pandas must have a different genetic code than giant pandas.
O D. The DNA sequences of red pandas are likely to be more similar to
the sequences of raccoons than of giant pandas.
Answer:
D seems to be best answer if that was my test
Explanation:
makes the most sense
Answer:
D
Explanation:
A food product was produced at room temperature (20°C) and its water activity was 0.3. Then it was shipped to a store and its temperature was 30°C during shipping, which of the following could happen?
a. The product water activity will increase
b. The water content of the product do not changed
c. The product may be spoiled faster than expected
d. All of the above
Answer:
Hence the correct answer is All of the above.
Explanation:
With the rise in temperature, the water activity will increase and water movement between molecules will increase and this may allow the expansion of microorganisms leading to the spoilage of food.
Which of the following was not part of the original cell theory, but was added later after we learned more about cellular structure?
A. all cells have the same basic composition
B. all cells come from pre-existing cells
C. all cells have a nucleus
D. all cells have the same exact structures.
Answer:
c oooooooooooookkkkkkkkkkk
( 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. )
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.
In the respiratory system certain structures allow air to pass from the trachea to the lungs. They are lined with thin
muscles and coated with epithelial cells.These structures are called
O bronchial tubes.
O alveoli.
O bronchioles.
O lobules.
Answer:
bronchioles are the structure
Note that arteries have a thicker middle layer of tissue than veins. Why is this important and how does it affect the structure of the artery as compared to the vein?
Answer:
The correct answer is - To withstand the high pressure of the outflow of blood from the Heart.
Explanation:
The heart pumps blood to different body parts at high pressure so that it can easily reach all the parts of the body quickly. To able to hold the pressure of the blood pumped at high-pressure arteries need thick walls.
This pressure can be experienced as pulse and which required the walls of arteries and the middle layer or the tunica media to make it much thicker in arteries than in veins. In veins pressure caused by blood is very low pressure that allows them to be thin walls.
World class swimmers can swim the 100 meter freestyle in about 55
seconds. What is their approximate average speed?
A. 1.82 m/s
B. 1.67 m/s
C. 1.91 m/s
D. 0.55 m/s
Answer:
A. 1.82 m/s
Explanation:
1.82 m/s is the best and true answer
Which insect when compared with each other leaves a distinct frass trail?
Choose the best answer.
a. Citrus leafminer
b. Citrus peelminer
Among the two options, the insect that leaves a distinct frass trail is the citrus leafminer (option a).
The citrus leafminer (Phyllocnistis citrella) is a small moth that infests citrus trees. Its larvae mine within the leaves, creating serpentine tunnels or trails as they feed on the leaf tissue. These feeding tunnels are often accompanied by visible frass, which is the excrement or waste material produced by the insect.
The distinctive frass trail left by the citrus leafminer is a characteristic sign of its presence and activity. As the larvae tunnel through the leaf, they push out frass along the length of the feeding tunnel. This frass appears as dark, winding lines or trails on the surface of the leaf, following the path of the larval mining activity.
On the other hand, the citrus peelminer (Marmara gulosa) is another insect that infests citrus trees but does not leave a distinct frass trail. The larvae of the citrus peelminer mine under the citrus fruit peel, causing irregular winding tunnels within the fruit. However, they do not leave visible frass trails like the citrus leafminer.
Therefore, when comparing the two options, the citrus leafminer (option a) is the insect that leaves a distinct frass trail, making it a useful diagnostic characteristic for identifying its presence and distinguishing it from other pests infesting citrus trees.
To learn more about citrus leafminer, here
https://brainly.com/question/33967117
#SPJ2
