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If your reader is supposed to compare multiple plots, put them in the same graph. If the result is too cluttered use different graph, at least keep the scales consistent so they can be easily compared.
Use different shape and line types to distinguish multiple plots on the same graph. Color will be lost if IT is reproduce in black and white.
Use scientific notation with units when appropriate . Be careful about the sign on the exponent. use as few digits as possible. The precision of the reading depends on the graph division, not the number of trailing 0.
Line graphs compare two variables. Each variable is plotted along an axis . A line graph has a vertical axis and a horizontal axis. So, for example, if you wanted to graph the height of a ball after you have thrown it, you could put time along the horizontal, or x-axis, and height along the vertical, or y-axis.
Circle or pie graphs are particularly good illustrations when considering how many parts of a whole are inception. The pie chart is then divided very much as a baker's pie would be into slices that represent the proportional amounts of time spent on each activity.
A histogram can be constructed by segmenting the range of the data into equal sized bins (also called segments, groups or classes). For example, if your data ranges from 1.1 to 1.8, you could have equal bins of 0.1 consisting of 1 to 1.1, 1.2 to 1.3, 1.3 to 1.4, and so on.
Graphs can tell you a lot about the design of an investigation, but they don't tell you everything. For example, they don't usually tell you which variables were controlled, the sample size, or the method of measurement. So there are lots of questions to ask to find out about validity and reliability, and also about the actual context of the investigation.