Will mark brainliest and give thirteen points but you must give explanation

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Ais a group of individuals of the same that exist together in the same place at the same time

Describe the layers of the suns atmosphere?