Active transport can be defined as the movement of?

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A. substances from a region of high concentration to a region of low concentration
B. substances from a region of low concentration to a region of high concentration across a living cell membrane
C. substances across a living cell membrane using energy from the cell
D. movement of molecules in a medium

Correct Answer: Option B

B. substances from a region of low concentration to a region of high concentration across a living cell membrane

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