Answer:
D. the dolphin in the back diverge under different selective pressures, which accounts for their difference
Explanation:
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I believe the answer would be B
I believe that this would be the inner membrane, or C. This is because the phospholipid layer is between the outer layers in the membrane, greatly restricting access inside and outside of the cell.
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Fish and marine mammals sift out the salt from the water, then they drink it.
