Answer:
The official definition for cardiorespiratory endurance is "Cardiorespiratory fitness refers to the ability of the circulatory and respiratory systems to supply oxygen to skeletal muscles during sustained physical activity."
Based on that, the answer is A.
*<u><em>Just for citation purposes, the definition is from Wikipedia.</em></u>
A I think it would be muscles and bones
Explanation:
Q2: To use, for example marijuana can help a lot with the body. Why do you think the government banned them? The uses are to modifiy someone or make someone powerful.