Fat sources in our diet should be low in .
a. oleic acid
b. saturated fats
c. monounsaturated fats
d. polyunsaturated fats
e. unsaturated fats

Wikipedia aswell can be used to solve the following questions

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.