Infertility can result from problems with a woman's or a man's reproductive system, or from problems with both. what can increase a man's risk of infertility?
a. pelvic inflammatory disease
b. exposure to radiation and toxins
c. exposure to genital warts

Iwould say read. (b)

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.

Answerfact;