Which of the following characteristics first developed in reptiles ?
Amniotic eggs
Scales on skin
Four-legged body
Skull and vertebral column
A
Amniotic eggs
B
Four-legged body
C
Skull and vertebral column
D
Scales on skin
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Solution
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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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