amphebians, reptiles , birds and mammals indicate a common ancestry as they have

a] two eyes

b] tail in the embryo stage

c] four limbs

d] dry skin

The correct option is (c) tail in the embryo stage. 

Post anal tail is a characteristic feature of chordates. So, its presence in fishes, amphibians, birds and mammals indicate a common ancestry.

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c) four limbs because basic structure of their limbs are similar.

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ans: b

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