Problem: What is the single unique characteristic that distinguishes extant birds from other extant vertebrates? A) endothermy B) feathers C) an amniotic egg D) flight E) a four-chambered heart

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Aminote Phylogeny:

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Problem Details

What is the single unique characteristic that distinguishes extant birds from other extant vertebrates? 

A) endothermy 

B) feathers 

C) an amniotic egg 

D) flight 

E) a four-chambered heart

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