Molecules by protein; move insoluble molecules across plasma membrane: pinocytosispassive diffusionfacilitated transport

active transport
An active transport is the process by which a substance is transported or transferred from one area to another using a chemical energy in the course. 

As oppose to passive transport, active transport’s key to its description uses energy to be able to transfer the said substance. This is important in a lot of aspects such as providing the needed elements or compounds in cellular activity. 

Diffusion occurs because of the movement of molecules from the region of higher concentration to the region of lower concentration.

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