Which statement correctly describes infertility?
a. Infertility only occurs in females.
b. Infertility is always caused by low sperm counts in males.
c. Infertility is diagnosed when a couple is unable to become pregnant after 7 months.
d. Female infertility is only caused by hormonal imbalances.
e. Female infertility may be caused by environmental factors, such as rigorous physical exercise.
ANSWER: a
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A. Platyhelminthes. B. Mollusca. C. Arthropoda. D. Cnidaria.
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A. one B. eight C. two D. sixteen E. four