Why Does External Fertilization Typically Occur Much More Often in Aquatic

Multiple Choice

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.