D, because skin tans to help us stand being in the sun without getting burned.
An example of physiological adaption is being able to digest milk. Before, humans were not able to digest milk before we developed enzymes that now make us have the ability to do so, thus allowing us another food source.
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Probability is the term you seek.
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When the plates are at the mid ocean ridges thay are spreading apart creating new ocean floor. this is also called a divergent boundary
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b and d btw are you taking an exam? Or test?
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