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Answer:
D. the dolphin in the back diverge under different selective pressures, which accounts for their difference
Explanation:
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Dolphins and bats share a common ancestor that is more recent than the one shared with birds.
Homologous bodies
Homologous organs are those that may or may not perform the same function, but have the same basic structure and the same embryonic development. This means, therefore, that individuals who have these organs have shared ancestry.
Whit this information, we can conclude that dolphins and bats share a common ancestor that is more recent than the one shared with birds.
Learn more about Homologous organs in brainly.com/question/11019619