Exam During facilitated diffusion,
which of the following do
molecules use as transportation
when they are too large to move
through a cell membrane?
A. air pockets
B. vacuoles
C. the endoplasmic reticulum
D. protein channels.

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.

which fault and or fold did you find most difficult to diagram