Question

state the reason why most of terrestrial animal fertilization take place internally​

Answer 1

Answer:

It is so because the animal's gamete can swim to each other and can fuse together in water . But in land animals the gametes will need a locomotary organ with which it'll be able to move.. which the gametes dont posses.. thus the fertilization takes place internally

Answer 2

Answer:

The terrestrial environment changes more frequently than the maritime environment. So, in order to enhance the chances of fertilisation survival (since the interior environment is essentially constant), terrestrial animals fertilise internally.

Explanation:

Since the gametes of the animal can swim to one other and fuse together in water, this is the case. However, gametes in land animals require a locomotary organ to move, which the gametes lack. As a result, fertilisation occurs internally. In simple words, it occurs when terrestrial animals release their eggs and sperm into the environment, and sperm can never reach the eggs without a medium to float in.