Question 21 As human migrated away from the equator, what may have been a selective
pressure against more melanin?
Cold weather and too much body hair
Lower UV radiation and more DNA mutations
Higher UV radiation resulting in more vitamin D synthesis
Lower UV radiation resulting in less vitamin D synthesis

Higher UV radiation resulting in more vitamin D synthesis.

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Explanation:

Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years.

Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years.During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy