Give a reasonable explanation why segments 2 and 4 are not associated with temperature increases even though heat is added a constant rate.
a) the atoms in the molecules are rearranged with the absorbed heat energy. b) the velocity of the molecules speed up.
c) the heat energy is used to break intramolecular bonds.
d) the heat energy is used to increase the distances between molecules.

d the  heat energy is used to increase the distances between molecules.

Explanation:

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.

explanation:

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