Drosophila eye color is an x-linked trait. red eye color is dominant, and white eye color is recessive. which punnett square shows the probability that 100 percent of offspring will have red eyes?

They create genetic variations

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.