Q1Name three systems for treating sewerage before it flows into the water ways Q2 Which of these system you think are the most useful you think and why
1.Where does the sewage water end up?

2.What will happen if sewage water is not
cleaned?

3.How do bacteria help in a sewage
treatment plant?

Answerjoe ran 130 yards;

Pretty ssure the answer re her answer is b hope this : )

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.