Which of these are considered long-term human-induced environmental changes? check all that apply.

-pollution
-human-created mass extinction
-eutrophication
-non-sustainable harvesting
-ozone layer destruction
-global warming

Cause of he different elevations  hope this ?

The figure is not necessarily a parallelogram because only one diagonal is bisected and only one pair of sides is congruent.

The highest point of a hill (or mountain) is a single point.
a single point can only be precisely marked with a dot. 
putting on a contour line is impossible  on a single point because the contour line is created after multiple points that have the same hight are marked, and after that, all of those points are connected with a line that creates a closed area. so the highest point, as said above, is a single point, there are no other points with the same height, so the only possible way for it to be marked is with a dot, and there is no possibility for a contour line.