13. on a topographic map, the elevation of an area with contour lines that are very far apart is

a) nearly flat

b) very steep

c) mountainous

d) constantly changing

A topographic map shows both the man-made and natural features present on the surface of the Earth in two-dimension using the contour lines. The elevations on this map is shown with the help of these contour lines. A topographic map shows the different geological features of the Earth's surface.

In this map, if the contour lines are far apart, then, it means that the area between those contour lines is almost nearly flat.

Hence, the answer is 'nearly flat'.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;