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

question 4

Multiple Choice

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 are correct

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