Why does external fertilization typically occur much more often in aquatic animals than in terrestrial animals?
A) The gametes are hydrophobic, so they must be suspended in water to avoid clumping.
B) The gametes must be produced in large numbers, which can occur only in aquatic environments.
C) Terrestrial species typically only have one testis, limiting sperm production.
D) The gametes must be kept wet to avoid desiccation.

Question

Quizplus · Accepted Answer

External fertilization requires the gametes to be suspended in water, which provides a constant environment to keep the gametes wet and avoid desiccation. This is much easier to accomplish in aquatic environments than in terrestrial environments, as water is readily available to aquatic animals.

Why Does External Fertilization Typically Occur Much More Often in Aquatic