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Here are the correct matches between the definitions in Column A and the terms in Column B:
1. **active transport**: a. The movement of particles from an area of low concentration to high concentration. Requires energy.
2. **passive transport**: b. The movement of particles from an area of high concentration to low concentration. Does not require energy.
3. **facilitated diffusion**: c. The movement of particles across a membrane that requires the use of proteins but does not require energy.