What’s is a plain or a plateau

Plains and plateaus are both flat areas of land; the main difference between plain and plateau lies in their elevation. A plateau is a flat land that is raised significantly above the ground whereas plain is a flat, low-lying area.

Explanation:

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

the answer is "a.) well–developed vascular system."

explanation: