Which one of the followings in birds indicates their reptilian ancestry?

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Question:Which one of the followings in birds indicates their reptilian ancestry?

1.Eggs with a calcareous shell

2.Scales on their hind limbs

3.Four-chambered heart

4.Two special chambers crop and gizzard in their digestive tract

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  1. Which one of the followings in birds indicates their reptilian ancestry?
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