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Do you think genetics play a role in the different skin colors we have on the top of our arms vs the bottom? Why or why not?
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Do you think genetics play a role in the different skin colors we have on the top of our arms vs the bottom? Why or why not?

User SpacePotatoes
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the top of our arms may be darker because they get more exposure to the sun than under our arms causing them to be lighter

User DalyaG
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