If a hypothesis is supported by several expirements it may become

ANSWER:

If a hypothesis is supported by too many experiments, it may become a theory.

EXPLANATION:

Hypothesis is a supposition or proposed explanation for any investigation. Hypothesis is the starting point of any investigation.

When hypotheses need to be verified, experiments are conducted to either prove it to be true or false. When several experiments provide the hypotheses to be true, it becomes a theory. A theory is a generally or scientifically acceptable principle or fact.  

Yes experiencing a muscle fatigue is a way  for the body to maintain the body temperature because whensoever the body is running out of breath because of exercise then the oxygen requirement of the body is 15-20 times more because of this there is a increase in body temperature and as a result of this body starts sweating and this sweating results in cooling down the body temperature.This process of regulating the body temperature is called homeostasis. Muscle fatigue is caused due to deposition of lactic acid in muscles that leads to pain in muscles and this is caused when anaerobic respiration starts due to lack of oxygen.