3. What should be done to provide additional support for the generalization that human arm span is a characteristic that falls within a range of lengths, with most lengths falling in the middle ranges?​

It would be a rusting car, for sure 

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.