What do lines on a contour map indicate?
a. elevation above sea level
b. degrees east and west of the equator
c. where geological features converge
d. degrees north and south of the equator

The answer is c. they had seedshope this

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.