What is diffusion?
Answer and explanation
Correct answer: C. The movement of molecules from a high concentration to a low concentration
- Step 1: Molecules move randomly and spread out.
- Step 2: The net movement is down the concentration gradient, from high to low.
Answer
The movement of molecules from a high concentration to a low concentration.
Why not the others: Movement of water through a membrane from a dilute to a concentrated solution: this is osmosis. Movement of molecules against a concentration gradient using energy: this is active transport. The splitting of a cell into two identical cells: this is mitosis.
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