Fertilisation in Animals: External vs Internal · Zoology

Internal fertilisation reduces dependence on water because:

  1. Gametes are released in air
  2. Fertilisation occurs inside the body
  3. Eggs lack protective coverings
  4. Sperm are immobile
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Correct answer: Fertilisation occurs inside the body

Since fertilisation occurs inside the female body, internal fertilisation does not require an external aquatic medium. This is advantageous for terrestrial life.

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