Organs combine to form what/9315362/142aa407? utm_source=registration

I believe you are asking about the "triangle" we were tought a simple triangle. Cells at the bottom because there are the most of them, tissues next, organ next, and organ system at the top. So I believe the answer you are looking for is Organ System.

Answerfarmer's market; (b) would be my second choice

The talk test measures ease of speaking during exercise;