The nucleus of the eukaryotic cell is important because it A. Controls the passing of substances through the cell membrane
B. Its rigidity controls the passing of substances through the cell wall
C. Contains DNA and controls the cell

For this question I think the answer is C.

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: