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a graph key is when one end of the graph goes into a nother graph and makes baby graphs.
a key on a graph is used to show you what each symbol means
A key can make it easier to interpret the data sets that each part of the graph represents, especially if there is no room in the graph area for labels.
You need a key so people can see what the picture your picture graph uses means.
A bimodal graph in which the modes are at the extrema.