Which process must occur before collection?

a: precipitation

b: condensation

c: evaporation

d: none of the above

Hey there 

Precipitation  is the process that must occur before collection. 

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.