Google it maybe pay attention next time
Answer:
B) Valves closing
Explanation:
A healthy heart makes a lub-dub sound with each beat. This sound comes from the valves shutting on the blood inside the heart. The first sound (the lub) happens when the mitral and tricuspid valves close.
Heat exhaustion is when your body starts to decline from the heat but not too much and your body just starts to get exhausted from the heat but with a heat stroke your body just starts to give up and it's too much heat almost similar to an regular stroke just with heat *hope this helps*
Answer:
true
Explanation:
if you do anything in a group youll want to be the best at it, humans are socail and pack type creatrues that do their best work as a group
