Question

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for diffusion to occur, which condition must be met? a hypotonic external environment must exist. dynamic equilibrium must exist. a concentration gradient must exist. a hypertonic external environment must exist.

Explanation:

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. A concentration gradient, which is a difference in the concentration of a substance across a space, is essential for this movement to occur. Hypotonic or hypertonic environments are related to osmosis (water - specific diffusion) and dynamic equilibrium is a state that can be reached after diffusion occurs, not a requirement for diffusion to start.

Answer:

A concentration gradient must exist.