Millions of sperm are needed because most of them don't make it up there to the egg. So i'm thinking maybe more sperm means the higher chance of the egg being fertilized.<span />
Asexual reproduction is not as widespreaded in animals as it is in plants.
Answer:
The answer is unicellular
Cells of various types have different functions because cell structure and function are closely related. It is apparent that a cell that is very thin is not well suited for a protective function.
