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Which of the following observations best supports the conclusion that dolphins and sharks do not have a recent common ancestor?
A. Dolphins form social groups, but sharks are solitary.
B. Dolphins hunt during the day, but sharks are nocturnal.
C. The number of dolphin species is far less than the number of shark species.
D. The jawbone structure in dolphins is very different from the jawbone structure in sharks.
this is because the traits in all the other options are acquired traits and on this basis, we cannot classify them. Instead, we look for some deeper features like the structure of their bodies. Thus, i conclude that the the answer is D
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