Which of the following must be true to consider something to be alive ? a. it must be able to replicate its dna b. it must be able to response to light c. it must be able to covert energy from one form to another d. it must be to move

All of the above I believe is the answer

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.