Fertilisation in Animals: External vs Internal · Zoology

Why is external fertilisation rare in terrestrial environments?

  1. Low oxygen availability
  2. Difficulty in gamete transport
  3. Risk of gamete desiccation
  4. Lack of mating behavior
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Correct answer: Risk of gamete desiccation

In terrestrial environments, gametes are at high risk of drying out. This makes external fertilisation inefficient on land.

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