Conception is most likely if a man ejaculates more than _____ million sperm per milliliter of semen? ...

Conception is most likely if a man ejaculates more than _____ million sperm per milliliter of semen?
 
  10
  100
  20
  200

Question 2

In about what proportion of cases can the cause of a couple's infertility be traced to the man?
 
  one-third
  one-half
  two-thirds
  three-quarters

Question 3

From a biological perspective, women should try to conceive before age ______ and men before age ______.
 
  20; 30
  30; 40
  40; 50
  50; 60

Question 4

In the United States, what percentage of couples are infertile?
 
  15
  25
  50
  7

Question 5

Infertility is defined as being unable to conceive after trying for at least how many months?
 
  3
  6
  9
  12