Birds and crocodiles share a more recent common ancestor than either group shares with lizards or mammals. Lizards and crocodiles have a common ancestor also shared by birds. Which of the following statements about the relationships among these organisms is most accurate?
a. Birds and crocodiles are a monophyletic group.
b. Lizards and crocodiles do NOT compose a monophyletic group.
c. Birds, crocodiles, and lizards taken together compose a monophyletic group.
d. Birds, crocodiles, lizards, and mammals taken together also compose a monophyletic group.
e. All of the above.
Ans: e. All of the above.
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