what questions do you still have about trees and their relationship with carbon dioxide (co2 ) in the atmosphere

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.

Lacking something of the ozone layer

Blindness is your answer