Human populations in low-uv environments tend to have more lightly pigmented skin. one explanation is that the selective pressure for dark skin decreases as uv intensity decreases. at the same time there is selection for lighter skin to absorb more uv radiation, which is needed for vitamin d production. what evidence supports the vitamin d hypothesis for the evolution of lighter skin tones?
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Which label correctly identifies what x represents in the concept map?
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Human populations in low-uv environments tend to have more lightly pigmented skin. one explanation i...
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