Describe the environmental conditions that are thought to have existed during the haden eon

Earth was most likely violent and very hot for its first 700 million years, a time now called the Hadean eon. Many asteroids, meteorites, and comets struck the plants, releasing enormous amounts of heat. Meanwhile, the radioactive decay of elements trapped deep within Earth released heat as well. These intense materials separated into Earth's layers. Hydrogen, carbon monoxide, and nitrogen gas were released from the interior.

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.