Why is internal fertilization essential to terrestial animals?

Answer 1

Most terrestrial animals - and some aquatic animals - rely on internal fertilization in which the female retains the egg(s) within her body and receives sperm from the male. Internal fertilization increases the probability that sperm and egg will meet successfully.
Simply put internal fertilization is necessary to the survival of terrestrial animal species. The moisture and protection within the female body keep the egg or embryo as well as the sperm viable long enough for successful fertilization.
As noted in the answer above there are exceptions, but while these are terrestrial or semi terrestrial animals their reproduction is in the water.

Answer 2

inner fertilization is needed for terrestrial animals because of the fact the possibility that sperm and egg could come into touch with one yet another any incorrect way is extremely narrow. inner fertilization helps the sperm to be deposited in a targeted proximity to the egg, for that reason increasing the possibility that's going to be fertilized. if we had exterior fertilization, the sperm could have not got any danger..a remark on the above answer, it has not something to do with water because of the fact interior the sea there is numerous water..doesnt make experience. desire this helps

Answer 3

It's not essential to terrestrial animals, it's just the most efficient method of reproduction. Many terrestrial animals use external fertilization--like frogs & toads, for example. Most of the "higher" animals do use internal fert however.