Answer:
The correct answer is: geography and UV radiation.
Explanation:
Skin variation occurred thanks to evolution, and was driven as a consequence of the geographical location of different populations of humans.
The humans that lived in hot and sunny places, closer to the equator, where much more exposed to the sun's ultraviolet radiation. In order to survive the amount of UV lights that they were exposed to, new humans in those regions were being born with a darker skin tone, which was rich in melanin (a brown pigment that protects us from the sun radiation).
Contrary to these humans that lived in the tropical areas, the humans that populated the areas that were closer to the poles, developed much lighter skin as a result of lower amounts of melanin in their skin. Since sun exposure in the poles is very limited, humans needed to receive as much as they could for the production of Vitamin D, and thus, their skins got lighter and less protected.
The could tell by solar radiation and dark matter, they didnt know were dark matter was but they new it was there
I'm not sure but think its A
You would revise the simulation so users can evaluate the role of human activity in the pH of the ocean by lowering the temperature.
<h3>What is pH?</h3>
pH may be defined as the power of hydrogen. It determines the acidity or basicity (alkalinity) of any substances under any temperature or pressure.
The role of human activity affects the overall consequences of oceans to a larger extent.
Therefore, you would revise the simulation so users can evaluate the role of human activity in the pH of the ocean by lowering the temperature.
To learn more about Oceans, refer to the link:
brainly.com/question/26846829
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