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Movement of substances from high concentration to low concentration is called
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Active transport
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Passive transport
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Facilitated Diffusion
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Option 4
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Passive transport refers to the movement of substances from an area of high concentration to an area of low concentration without the use of energy. This process occurs spontaneously and does not require any external force or energy input. It includes simple diffusion, where molecules move directly through the cell membrane, and facilitated diffusion, where molecules are transported across the membrane with the help of specific protein channels. Unlike active transport, which requires energy expenditure, passive transport relies on the natural concentration gradient to drive the movement of substances.