Which of newton's laws introduces the concepts of action/reaction forces? a.1 b.2 c. none of them do d. 3

It would be D.3

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the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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