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Zinaida [17]
3 years ago
9

EASY BIOLOGY QUESTION

Biology
1 answer:
Anni [7]3 years ago
4 0
The cell because they are moving from high to low concentration
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Hey y'all I need help with this bio question: what are the pros and cons of different skin tones in different parts of the world
d1i1m1o1n [39]
Oh this one is so cool!

It basically all boils down to Vitamin D! We need this essential vitamin to help our body build hormones and regulate calcium. Our bodies make Vitamin D when we are exposed to the UV rays found in sunlight. But as we all know, too much sunlight isn’t good because these UV rays can harm us. Melanin (the chemical that our bodies produce to darken skin tone and hair color) provides protection from UV rays by absorbing them. However, this means that the more melanin that is produced by someone’s body results in less absorption of UV rays and a decrease in Vitamin D production. But for someone living around the equator or in the tropics that doesn’t matter because there’s lots of sun all the time. So for humans living in these areas where there’s lots of sunlight year round, it’s beneficial to have darker skin to protect from the harm of UV rays. People living in these areas still get plenty of Vitamin D though because of that year round sunshine.

Now what about those who’s skin has less melanin, such as those found in the higher latitudes? Well with less sunlight year round, their bodies had to adapt to be able to get enough Vitamin D. So less melanin is produced by the body in order to absorb the lesser amounts of UV rays to make Vitamin D. Lighter skin is, therefore, more beneficial the farther away you go from the tropics.

So essentially:
Pro of Darker Skin tones
-Protection from harmful UV rays

Con of Darker Skin tones
-Less absorption of UV rays and less production of Vitamin D

Pro of Lighter Skin tones
-Greater absorption of UV rays and more Vitamin D production

Con of Lighter Skin tones
-Less protection from harmful UV rays (resulting in sunburns and, in extreme cases, skin cancer)

This is of course the biology answer. The social impacts of different skin tones is a whole different story that you can ask in the history section.
6 0
2 years ago
Compare and constraint negative and positive feedback mechanism and explain how they relate to homeostasis
gavmur [86]

Explanation:

Positive feedback occurs to increase the change or output: the result of a reaction is amplified to make it occur more quickly. Negative feedback occurs to reduce the change or output: the result of a reaction is reduced to bring the system back to a stable state.

6 0
2 years ago
BRAINLIEST
Allushta [10]

Answer:

C) Mass

Explanation:

Mass is made up by the amount of protons, neutrons, and electrons in an object. Mass is essentially the capacity of an object, which many times is mistaken for weight.

Shape, color, and size are all common ways to determine the species of the bird, when only looking at the egg.

Hope this helps! :)

6 0
3 years ago
What causes the different layers in our atmosphere?
Aleksandr [31]

Answer:

changes in temperature that happen with increasing altitude.

8 0
3 years ago
Julie's grandmother has thickening and hardening of her arteries caused by fatty deposits, cholesterol, and other substances dep
kondaur [170]
Hi the answer to your question is Julie's grandmother has Atherosclerosis.
Hope this helps you.
4 0
3 years ago
Read 2 more answers
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