Which of these genetic disorders is most likely to be influences by environmental factors? A.
lung cancer

B.
color blindness

C.
hemophilia

D.
sickle cell disease

The higher you go up the less oxygen there is 

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.

Everything that you need in a lab is in your lab