Of the millions of sperm deposited into the vagina during intercourse, only a few hundred reach the secondary oocyte. What happens to the rest?
A. Some never become motile.
B. They may become disoriented and lose direction.
C. They may be destroyed by the acidic environment of the female tract.
D. Many leak out of the vagina.
E. All of the choices are correct.
Answer: E
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