Question

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

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Answer 1

Answer:

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terrestial animals, by definition, live in dry environments. However, cells do not do well in dry environments (hence why we have skin (a largely protein structure) that helps keep us from drying out and collapsing (the cell membrane of animals is rarely directly exposed to air, and where it comes close there is usually a layer of fluid between the membrane and the air. 

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Answer 2

Answer:

Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. The embryo is isolated within the female, which limits predation on the young. Internal fertilization also enhances the fertilization of eggs by a specific male.