Question

i is the passage of a substance through a cell membrane from an area of higher concentration to lower concentration that does not require help from other molecules.

Explanation:

Diffusion is the process where a substance moves through a cell membrane from a region of higher concentration to one of lower concentration without needing assistance from other molecules. This is a fundamental concept in cell biology related to how substances like oxygen or carbon dioxide move across cell membranes.

Answer:

Diffusion