Fertilisation in Animals: External vs Internal · Zoology

Internal fertilisation is most commonly seen in:

  1. Aquatic invertebrates with broadcast spawning
  2. Fishes with external spawning
  3. Reptiles, birds, and mammals
  4. Echinoderms
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Correct answer: Reptiles, birds, and mammals

Internal fertilisation is characteristic of reptiles, birds, and mammals. It protects gametes and embryos from environmental hazards.

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