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Which one of the following in birds, indicates their reptilian ancestry?

1. Scales on their hind limbs
2. Four-chambered heart
3. Two special chambers crop and gizzard in their digestive tract
4. Eggs with a calcareous shell

Correct answer: Scales on their hind limbs

Solution

Scales on the hind limbs are a direct reptilian feature retained in birds, showing their evolutionary ancestry. The other options are either not uniquely reptilian or are adaptations common in birds.

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