Fertilisation in Animals: External vs Internal · Zoology

Why do animals with external fertilisation usually produce a large number of eggs?

  1. Eggs are fertilised internally
  2. Survival rate of embryos is low
  3. Parental care is extensive
  4. Embryos develop inside the body
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Correct answer: Survival rate of embryos is low

Because many eggs and sperm are lost in the environment, producing a large number increases the chance of successful fertilisation and survival.

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