Well it has to evolve over time eventually thats why ;)
Answer: The tail gives the sperm cell development. It whips and undulates with the goal that the cell can venture out to the egg. Following sperm statement in the female regenerative plot, initiation of tail development is stifled until the sperm is conveyed to inside a moderately short separation of the egg.
Explanation:
The answer is D.
It is the most needed because if the waste of the body doesn't get removed then you will become very ill and possibly die.
Hope this helps! :)
