How did darwin collect data while on the beagle? a. he collected specimens. b. he observed plants and animals. c. he recorded detailed information about the plants and animals he saw. d. all of the above

D, he did all of the above

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.