I will crown if right! :) Please help me finish so I can get some rest.
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In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

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What atoms are found in nucleic acid and what atoms are found in proteins? compare the monomers that make up a nucleic acid versus what are the monomers that make up a protein?