4. Which of the following is an example of a scientific theory? Force equals mass times acceleration. Matter can be neither created nor destroyed. There is probably life on Mars. Matter behaves the way it does because it is made of atoms.

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.

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