If only one sperm is needed to fertilize an egg, why are so many ...

[ARLKQ]

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.

Question 2

Out of the several hundred million sperm that were deposited into the vagina, fewer than ____ typically reach the correct fallopian tube.
 
  a. two hundred c. twenty thousand
  b. two thousand d. two hundred thousand

[lgoldst9]

Answer to Question 1

ANS: D

Answer to Question 2

ANS: A

[ARLKQ]

TYSM

[nathang24]

Excellent