Fertilisation in Animals: External vs Internal · Zoology

External fertilisation is least likely to occur in:

  1. Marine fishes
  2. Amphibians
  3. Terrestrial mammals
  4. Aquatic invertebrates
Show answer and explanation

Correct answer: Terrestrial mammals

Terrestrial mammals rely on internal fertilisation due to land conditions. External fertilisation would expose gametes to desiccation.

Difficulty: Medium Question 15 of 20

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