If only one sperm is needed to fertilize an egg, why are so many sperm produced by a man?
a. This ensures genetic variability of a man's offspring.
b. The testicles themselves present a hostile environment for sperm as a way to ensure that the strongest sperm survive, thus most sperm die off even before ejaculation.
c. All of the sperm are produced during the development of a male fetus, and so, an abundant number of sperm are needed to provide a sufficient supply for a man's lifetime.
d. There are many "barriers" that confront a sperm on its journey to the egg, thus increasing the likelihood that some sperm will make their way to the egg.
ANS: D
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