Biology
Diffusion occurs when molecules move:
- from lower concentration to higher concentration.
- from higher concentration to lower concentration through a membrane.
- from higher concentration to lower concentration.
- when energy is used.
Answer
from higher concentration to lower concentration.
Reason — The movement of molecules (gas, liquid or solid) from higher concentration to lower concentration is called diffusion.
Particles do not move from lower concentration to higher concentration by diffusion; that movement is opposite to diffusion. Diffusion does not always occur through a membrane. Diffusion is a passive process, so energy is not required.
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