What is the overall goal of diffusion osmosis and facilitated diffusion?

Answer;

-All three work to move substances from one area to another to make it equal and stable.

Explanation;

-Diffusion, osmosis, and facilitated diffusion are the three types of passive transport.

-Passive transport is a process that allows the transportation of substances with out requiring cellular energy to proceed.

The overall goal of diffusion, osmosis and facilitated diffusion would be to move substances across a cell membrane. May it be that it needs energy to do this or not, these processes involves the movement of a substance from one place to another through a membrane. Hope this answers the question.