During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
Europe is the most likely answer.
Just took the test, the answer was 100, not 2
A lymphatic system. I really hope this answer helps you.
