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Why do materials diffuse across a membrane?

Answer 1

By diffusion the molecules move from an area of high concentration to an area of low concentration and also by active process.

Substances such as water, carbon dioxide, oxygen, ions, etc., pass through the cell membrane through a process known as diffusion.
Diffusion is a fundamental way for substances to pass through the cell membrane.

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Answer 2

Maya Anderson

Materials diffuse across a membrane due to the concentration gradient, where substances move from an area of higher concentration to an area of lower concentration, driven by random molecular motion.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.