A) Bird: lay eggs, mammals: give birth to young ones and reptiles; give birth to young ones.
B) Bird: lay eggs, mammals: give birth to young ones and lay eggs and reptiles: lay eggs.
C) Bird: give birth to young ones, mammals: lay eggs and reptiles: lay eggs
D) Bird: lay eggs and give birth to young ones, mammals: give birth to young ones and lay eggs and reptiles: lay eggs
E) None of these
Correct Answer: B
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