The motor unit is composed of both the skeletal and muscular systems.
By one year of age, that amount drops to about 65%<span>. In adult men, about </span>60%<span> of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than men, so they have about</span>55%<span> of their bodies made of water.</span>
I think its compression. I hope I helped :)
B is your answer, it can indicate when you are working above, below, or in your target zone.
Pretty sure it’s studies because you read textbooks to learn more about the subject. So B.Studies