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andre [41]
3 years ago
15

Natural selection ___.

Biology
1 answer:
Afina-wow [57]3 years ago
6 0
The answer is A) prepares organisms for future changes in the environment
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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
Explain the connection between your  body and supernova
svet-max [94.6K]
Well our bodies are made from atoms which are also in supernovas. theoretically atoms make everything so that could be a connection. also, supernovas and bodies all have a time clock, or they were born at one point and will end up dying at one point.
4 0
3 years ago
What was the first element that developed in the universe after the Big Bang?<br> Explain why.
Paladinen [302]

Answer:

Hydrogen

Explanation:

hydrogen couldn't form until the universe had cooled enough to allow their nuclei to capture electrons, about 380,000 years after the Big Bang, Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei.

5 0
3 years ago
What are some erosive forces?​
quester [9]

Answer:

Erosive Forces:

•light particles float

• some particles dissolve into water

• abrasive forces wear down rocks

3 0
3 years ago
Read 2 more answers
Zooming in on an object makes it look farther away than what it really is.<br> True or False
gregori [183]
False because zooming in makes it seem bigger so you can see more details. Zooming out would make it look farther away than what it really is
6 0
3 years ago
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