Protective barrier that controls what goes into and out of a cell a. cytoplasm b. organelles c. cell membrane d. chloroplast

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:

can you list the answers so i can answer