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

  • A
    Two special chambers,crop and gizzard,in their digestive tract
  • B
    Eggs with a calcareous shell
  • C
    Scales on their hind limbs
  • D
    Four-chambered heart

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Similar Questions

Identify the correct statements regarding class $Aves$.
$I$. Forelimbs are modified into wings and hindlimbs are modified for walking and swimming.
$II$. Heart is completely four-chambered.
$III$. They are homeotherms.
$IV$. They are oviparous and development is direct.

Which structure is useful for grinding and crushing food in birds?

The $Kiwi$ is found in:

Presence of furcula is a characteristic feature of

The presence of feathers and the power of flight are characteristic features of:

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