Fertilisation, Development and Birth in Animals · NCERT Biology

Viviparous animals are those that:

  1. Lay eggs that hatch externally
  2. Show external fertilisation only
  3. Give birth to fully developed young ones
  4. Undergo complete metamorphosis
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Correct answer: Give birth to fully developed young ones

Viviparous animals give birth to fully developed young ones. Development occurs inside the mother's body.

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