Why is it important to keep your back and neck straight while performing a hamstring stretch?
a. you can't touch your toes with your neck and back bent.
b. arching the neck and back puts stress on the spine.
c. bending the back turns this into a spine stretch.
d. the hamstring is only stretched when the back is straight.

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.