The answer will depend on what "this graph" is!
A contour diagram.
no
hi
Yes, because a line graph deals with change over time, and so does height.
Yes, because a line graph deals with change over time, and so does height.
no
yes
It is not a suitable form of graph. A circle graph can be used for showing the relationship between a variable and its component parts. It is not suitable for illustrating changes with height.
No you could not.
You can, but it depends on what you hope to show. A bar graph, showing the numbers or proportions of people within height bands may be a more effective visual display.
line graph