We Don't See a Crop and Gizzard in Many Vertebrates;why

We don't see a crop and gizzard in many vertebrates;why do we see them in most birds?

A) Birds are more closely related to earthworms than we are and therefore did not lose this structure
B) Any animal that eats earthworms and insects needs these organs
C) Birds lack hands and teeth to reduce the size of food,and they need to gather food fast to avoid predators and competition
D) The bird "crop" and "gizzard" are really just names for the stomach and intestine and therefore other vertebrates actually have them
E) None of the choices is correct

Correct Answer:

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