Q.

______ are the first true terrestrial vertebrates.

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a

Mammals

b

Amphibians

c

Aves

d

Reptiles

answer is B.

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Detailed Solution

Reptiles are the true terrestrial vertebrates. Laying hard shelled (cleidoic eggs) allowed them to be completely terrestrial. Amphibians are the ‘imperfect group’ as they had to back to water for breeding.

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