I'm pretty sure the answer is
B.) To see if your exercise frequency is enough
Answer:
Left Atrium
Explanation:
The left atrium is the upper right chamber of the heart. The left atrium receives oxygenated blood from the lungs and pumps it down into the left ventricle which delivers it to the body.
I hope this helps you :)
Cardiovascular is probably your answer
Cardio- the heart
Vascular- vessels
Circulatory- blood
They have a good amount of water in the plant.
