Answer:
This is not part of school!
He should increase the speed in which he runs as the faster one runs the faster their heartbeat.
There are no choices. Sorry, couldn't help but there are no resources to help.
Laughing at them or making jokes is not a good way to support a friend.
A difference between the three are that arteries are larger than capillaries and veins. However, veins are larger than capillaries.
