Question

State the reason why most of the terrestrial animals fertilization takes place internally.

Answer 1

internal fertilization is more advanced.. if we talk about oogamous fertilization..large no. of male gametes are required as they are more prone to vulnerable condition

Answer 2

Answer :

The environment on terrestrial land keeps on changing than that of the marine environment. So inorder to increase the survival chance of the fertilization (internal environment is nearly constant) terrestrial animals’ fertilization takes place internally.