Two identical twins, Derek and Aaron, grew up in the same household without any health problems. For most of his life, Derek had a high-stress job and did not have time for exercise. Aaron, on the other hand, led a low-stress lifestyle and regularly exercised. How would their cardiovascular systems compare? a
Derek is more likely to have constricted blood vessels and would be more likely to suffer from high blood pressure than Aaron.

b
Derek is more likely to have relaxed blood vessels and would be less likely to have heart disease than Aaron.

c
Aaron is more likely to have constricted blood vessels and would be more likely to suffer a heart attack or stroke.

d
Aaron is more likely to have relaxed blood vessels, though they would be equally likely to suffer from a hardening of their arteries.