Which type of crust is typically thicker, older and less dense?

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.

Moving down the ramp from 6 meters to

Which structure in the cardiovascular system connect arteries to veins?