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Ivahew [28]
3 years ago
13

Everyone's skin contains about the same number of melanocytes even though people come in many different colors. How is this poss

ible?
Biology
1 answer:
Hatshy [7]3 years ago
6 0
This is because the melanocytes are located in the stratum basale. Lighter-skinned people usually have low basal levels, and exposure to UV radiation causes an increase which makes skin darker.
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Using at least two examples, explain how the process of evolution is revealed by the imperfections of living organisms.
Serga [27]

Answer:

Evolution is driven by rare mutations that occur in the DNA of organisms. These mutations  could be lethal, neutral and some advantageous. The lethal mutations cannot exist in a population because the offspring is unable to survive to term in pregnancy or dies just after birth. The neutral are ones that do not considerably affect the organisms – though they could result in a disadvantage. The beneficial ones are the one that is kept in the population by natural selection because they confer an advantage e.g in the fight for resources or escaping predation and etcetera. Therefore, it's like a game of chances by nature. Paleontologists discover many species of organisms some of which are imperfect  because nature produced them but they died off because their mutations gave them a disadvantage against better-adapted individuals.

The <em>Tiktaalik</em> fish from 375 million years ago became extinct because it did not well-developed eardrum for detecting vibrations in water which is significant in survival.

Dinosaurs during development of feathers had many imperfect species before the right wings for flight were conjured up by nature. An imperfect species is the <u><em>Tianyulong confucius</em></u> had stiff feathers that lacked vanes hence were not ideal for flight

6 0
3 years ago
All pros when conducting a lab experiment except?
Mrac [35]

Answer:

I personally believe that lab experiments are useful and an effective way to test and gather data. Even though they can often lack ecological validity and mundane realism they can easily be replicated and results can be retested, helping to prove/disprove data, ultimately leading to the creation of practical applications.

  • That psychologist can make statements about cause and effect because they involve the deliberate manipulation of one variable while trying to keep the other variables constant, unlike non-experimental methods.
  • Lab experiments can also be replicated due to the standardised procedures and measures, ultimately making it easier to check the reliability of the research/results and prove/disprove results if the research is conducted by another researcher.

6 0
3 years ago
WILL GIVE THE BRAINLEST
Lesechka [4]

Answer:

#2 is B #3 is

Explanation:

Plant cells have cell walls around them, and animal cells don't have cell walls. The cell walls give plant cells their boxy shapes. That's nice for plants, because it gives them the ability to grow up and out, where they can get lots of sunlight for making their food.

The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expression- the nucleus is, therefore, the control center of the cell.

4 0
3 years ago
Which of the following is involved in "double fertilization"?
ale4655 [162]
I belive the answer is all of the above
8 0
3 years ago
Which of the following best describes what happens to water molecules after they enter the atmosphere through the process of eva
sukhopar [10]
Once entering the atmosphere the heated up water vapor (that's the process of evaporation) cools back down (the atmosphere is cooler than the Earth you see). it makes clouds Their it will condense until it's heavy enough to fall to Earth as precipitation! 
5 0
3 years ago
Read 2 more answers
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