What term refers to the point at which environmental destruction becomes irreversible and systems exponentially decline?

a. carrying capacity

b. unsustainability point

c. tipping point

d. viability point

B) the unsustainable point is where environmental destruction becomes irreversiable

The answer is d. when it begins to fall back to the child's hand

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.