Tea Tree Oil is used commercially in many products including shampoos, body lotions and toiletries, but there is no legislation requiring manufacturers to state the concentration of tea tree oil in these products.
Line Graphs. One of the most common graphs you will encounter is a line graph. Line graphs simply use a line to connect the data points that you plot. They are most useful for showing trends, and for identifying whether two variables relate to (or correlate with) one another.
Graphs are often an excellent way to display your results. In fact, most good science fair projects have at least one graph. For any type of graph: 1  Generally, you should place your independent variable on the x-axis of your graph and the dependent variable on the y-axis. 2  Be sure to label the axes of your graphâ don't forget to include the units of measurement (grams, centimeters, liters, etc.).