MCQ
All birds have:
  • Internal fertilization, are oviparous and eggs are covered with calcareous shell.
  • B
    Nests to care their babies.
  • C
    Feather on their body and can fly.
  • D
    Oil gland at the base of tail.

Answer

Correct option: A.
Internal fertilization, are oviparous and eggs are covered with calcareous shell.

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