What is passive transport across cell membranes? Briefly explain any three types of passive transport.

Passive transport refers to the movement of substances across a cell membrane without the expenditure of energy by the cell. This movement occurs due to the natural physical properties of the substances involved and the concentration gradients across the membrane. Passive transport plays a crucial role in maintaining the balance of various molecules and ions within cells and their surrounding environment.

Three types of passive transport across cell membranes are:

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