Hello,
The answer should be option A "high intensity".
Reason:
A anaerobic exercise is something that benefits the muscles of the body these actives include: body building, matron runs, or anything that would build your muscles. Its not option B because short duration means low endurance and these activity's need alot of endurance in order to complete them. Its also not options C, and D because of the reasons above. Therefore the answer is option A.
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit
The answer is B. diarthroses
The skeletal system provides structure to systems in the body
The answer in the space provided is anemia. It is because anemia would likely cause other people who has a type of anemia experience a craving of iron or other objects as these are symptoms associated with it. That is why the person who has iron object cravings are needed to be tested if they have some sort of anemia, in order to identify what causes him or her to do it.