During bone growth, which significant event occurs at the surface indicated by the letter C?Ossification of the epiphysis of a long bone. bone resorptionappositional growthconversion of spongy bone to compact boneexpansion of the articular cartilage

They create genetic variations

Fungi is were it belongs

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.