Which two phrases best describe cells? A. Make up tissues
B. Made up
of
organs
C. The simplest level of organization of life
D. The most complex level of organization of life
SUB

To wear the full equipment.

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.