If carbon has an atomic number of 6, how many valence electrons does it have?

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:

a is the correct answer

how important do you think an instrument is to the musician who plays it?