Passive transport: mechanisms of movement across the membrane may be passive requiring no from the cell (diffusion ,facilitated diffusion, osmosis, and filtration)

Passive transport can be described as the movement of molecules from an area of higher concentration to an area of lower concentration. No energy from the cell is required during this process as the molecules are moving along the concentration gradient.

For example, osmosis is the process by which water molecules move from an area of higher concentration to an area of lower concentration and no energy is required for this process to occur.

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"a.) well–developed vascular system."