Why is cumulative risk a serious concern?

Cumulative risk can be prevented by taking proactive choices in order to lessen the chances of the risk. They apply to many people, and even though they may not always happen, they should be looked at in order to know how to avoid them.

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.