Where does the oxygen/carbon dioxide exchange take place in the human respiratory system?

answer: my answer would be a) scheduling workouts with your friend for consistent days and time

explanation:

for me personally i would be much more likely to go to the gym with a friend because i wouldn't want to cancel on them or stand them up.

diabetes,smoking,high blood pressure,high cholesterol,obesity,inactivity

i think it would be b the increase in body temp