The answer is all of the above
In extreme heat on the body can cause heat stroke
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The blood vessels shrink so that less blood with leak out of the wound, platelets ( tiny cells in the blood) stick together around the wound which stop the bleeding (like patching a leak). The blood proteins and platelets join together and form a clot, the clot acts like a mesh to stop the bleeding.
False, the amount of sleep your body gets will very much so effect your day. Sleep allows the brain and body to rest and grow, we need sleep to perform tasks throughout the day.