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Q.

Which of the following characters is found in all amniotes without exception?

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a

All amniotes are homeotherms.

b

All of them possess four chambered heart and renal portal systems

c

Dioecious animals with internal fertilization

d

Terrestrial animals with two pairs of pentadactyl limbs

answer is C.

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Detailed Solution

Amniota of vertebrates that undergo embryonic or fetal development within an amnion include the birds, reptiles, and mammals.  All amniotes are dioecious with internal fertilisation.Reptiles are poikilotherms. They have a three-chambered heart with incompletely divided ventricle. Snakes are limbless.
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