AP BIOLOGY

Detailed explanation-1: -In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion.

Detailed explanation-2: -Passive diffusion follows a concentration gradient, which relates to the transport of molecules from a location of higher concentration to a site of lower concentration without using chemical energy according to Fick’s law of diffusion.

Detailed explanation-3: -Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. You are familiar with diffusion of substances through the air.

Detailed explanation-4: -Passive transport does not require the cell to expend any energy and involves a substance diffusing down its concentration gradient across a membrane.