Why Is It Necessary for Many Sperm to Be Present

Why is it necessary for many sperm to be present in order for one to fertilize the egg?

A) A mass of sperm is necessary to open the uterine tube.
B) A mass of sperm is necessary to gain entry into the ovary.
C) A sperm cannot find the egg by itself.
D) The combined enzymes digest a path through the corona radiata and zona pellucida.
E) The combined motion of their flagella enables one sperm to push its way into the egg.

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