If energy is need to move materials into or out the cell, what is mostly likely occurring? a) active transport b) osmosis c) passive transport d) diffiusion

Osmosis and diffusion are both examples of passive transport, neither of which requires energy to cross the cell membrane from areas of high concentration to areas of low concentration.  Active transport is the process of moving molecules and ions from areas of low concentration to areas of high concentration.  Active transport requires energy in the form of ATP.    

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the match lol