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

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

Solution & Step-by-step Explanation

Birds evolved from reptilian ancestors. The presence of scales on their legs (hind limbs) is a direct morphological link to their reptilian past.

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Which one of the following in birds indicates their reptilian ancestry?
A
Eggs with a calcareous shell
B
Scales on their hind limbs
C
Four-chambered heart
D
Two special chambers (crop and gizzard) in their digestive tract

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