Why Do Some Biologists NOT Consider Reptiles to Be a Monophyletic

Why do some biologists NOT consider reptiles to be a monophyletic group?

A) Reptiles evolved independently at several different times in the past and from several different ancestral species.
B) Reptiles, birds, amphibians, and fish appeared in the fossil record at approximately the same time.
C) All reptiles do not reproduce sexually.
D) The ancestors of reptiles are the class Amphibia.
E) Birds are the direct descendants of some reptiles.

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