Which of the following characteristics first developed in reptiles ?

Amniotic eggs

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Scales on skin

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Four-legged body

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Skull and vertebral column

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Solution

The correct option is A Amniotic eggs
Reptiles and birds are amniote animals, which means that the eggs laid by females contain an elastic sac within which the embryo develops. But, reptiles are primitive than birds; so they developed the characteristic of amniotic eggs first.
So, the correct answer is option A.

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