This is the study of the natural processes that occur in the environment and how humans can affect them? A. Biodiversity
B. Environmental science
C. Ecology
D. Ecosystems
(Thank you for helping !)

I’m pretty sure the answer is c

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.