Before beginning an exercise program, a person should always
a. have a medical exam to make sure it's safe to begin exercising.
b. establish his or her maximum workout limit through one intense workout.
c. consult with friends to see what workout works for them and then copy their workout regimen.
d. attempt to run one mile to test his or her fitness level.

Explain why methicillin resistant staphlococcus aureus (mrsa) is more prevalent now than it was only 30 years ago. a. antibiotics cause mutations in staphlococcus aureus that lead to an increase in the number of methicillin-resistant strains. b. methicillin resistance causes an infection to spread more rapidly.c. frequent and inappropriate use of methicillin-type antibiotics has provided selective pressure that has resulted in an increase in the proportion of methicillin-resistant strains of staphlococcus aureus.d. diseases like aids have made people more vulnerable to infections from staphlococcus aureus.