10. The difference in the concentration of a substance across a space is called:
A. kinetic energy gradient
B. solvent gradient
C. concentration gradient
D. dynamic equilibrium

C. contraction gradient

Explanation:

The difference in the concentration of a substance across a space is called a concentration (equilibrium/gradient). ... (equilibrium/diffusion) is the simplest type of passive transport. diffusion. the diffusion of water through a selectively permeable membrane is called (osmosis/diffusion).

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