Which statement best describes why multicellular organisms have specialized systems? A. Systems fight against each other in the body.

B. One system can do everything in the body.

C. All systems work separately from each other.

D. Each system performs different functions that are necessary for life.

Idk i think the answer choice is number 1

They are k strategist i think

You grow to. e jansnnsns

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.