True because sprains can occur when walking or exercising on an uneven surface, landing awkwardly from a jump. knee — pivoting during an athletic activity
Answer:
Geography
Explanation:
geography is the study of physical features of earth and it's atmosphere. which is why it does not contribute to a perennial health problem.
Explanation:
As we age, our immune systems develop defenses against antigens and fights off lots of infections which could harm us.Our body makes lots of T cells when we are young, but slows down production after puberty. Nevertheless, the numbers of these cells in our body stays the same even when we are old. Our body changes in aging process like composition and structural elements of tissues, gone through puberty, your hormones increase, also your metabolismm developed rapidly, structure of your bones developed, etc.
I think it's D. Because the students impulse is to do it because its cool, because all their friends do it. Hope my answer helps you! :)