Which of the following pieces of evidence best supports the hypothesis that birds and crocodilians (crocodiles and alligators) are more closely related to each other than they are to other organisms?

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Bone structure provides strong evidence for evolution. It takes a long time for physical changes to occur, since many genetic changes might need to occur to alter proteins or development related to bone structure.

Just because organisms occupy the same niche or may have the same behavior does not imply relationship. These can occur due to convergent evolution or by chance.

Just because two organisms arose from the same period does not mean they are related. The Jurassic Period lasted tens of millions of years.