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).

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

b) the inside picture would look at a very high temperature in a very low ph