Which of the following is not a property of displacement?

A. Displacement can be negative.
B. Displacement describes a change in position.
C. Displacement is equal to the total distance traveled by an object in motion.
D. Displacement is equal to the final position of an object minus the initial position of the object.

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Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.