The structure that is common in the embryos of mammals, amphibians, birds, fishes and reptiles and which is an evidence of their common ancestry is the?

In his theory of evolution, Darwin implied that?

A. the struggle for existence among living organisms is sporadic B. the most successful organisms are those that best adapt to their environment C. organs of the body which are not regularly used by an organism will disappear D. any traits acquired by an organism...

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