John stretched while his muscles were cold. which negative effect could occur?
a. blood might not flow to his limbs.
b. his strength could decrease quickly.
c. he could injure or pull a muscle.
d. oxygen might not reach his muscles.

If John stretched while his muscles were cold, the negative effect that could occur is that C. he could injure or pull a muscle.
It is always important that your muscles are "heated" before you start exercising so as to avoid hurting yourself.

C. he could injure or pull a muscle

1. the answer is a parasite