Baylor College Medical School

Earth Science

101 4. Which letter of each factor that explains why reptiles became dominant land animals during the Mesozoic era.

a. Reptiles have shell-covered eggs that can be laid on land.

b. Reptiles had an important water-dwelling state (like the tadpole) in their life cycle.

c. Reptiles adapted readily to the drier Mesozoic environment.

d. Reptiles adapted to fill many environmental niches.

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A, D