A worldwide team of researchers pooled their data on the DNA and schooling of 126,559 people. All the genetic variations they examined accounted for about percent of the schooling differences among individuals in this large sample.

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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