Assertion: Homologous organs are similar in basic structure and embryonic origin, but serve different functions.

Reason: Similarity in basic structure points to common ancestry whereas diversity in function reflects adaptation to different modes of life.

A. Assertion is True, Reason is True; Reason is a correct explanation for Assertion.
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B. Assertion is True, Reason is True; Reason is not a correct explanation for Assertion.
C. Assertion is True, Reason is False.
D Assertion is False, Reason is True.