The cardiovascular system structure. Hope this helps :)
Answer:
Lets say there was a chemical, Chemical QXY that bound to electron carriers FADH2 and NADH and prevented them from reaching the electron carriers were inhibited
Essentially, multicellular organisms are made up of more than one cell. As such, they are different from unicellular (single celled) organisms that only consist of a single cell. Like unicellular organisms, there are a wide range of plant and animal multicellular organisms in existence.