Read the question below. check all of the scientific questions

- decrease the number of plants and animals living in the water.

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:

elements make up everything, and they combine to make compounds.

the answer is c