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In the context of Venn diagrams, the universe is not everything, but everything you're dealing with right now. Let's deal with the following list of things: moles, swans, rabid skunks, geese, worms, horses, Edmontosorum (a variety of duck-billed dinosaurs), platypusses, and a very fat cat.
A Venn diagram is a visual tool used to compare and contrast two or more objects, events, people or concepts. It is often used in language arts and math classes to organize differences and similarities. This simple graphic makes it easy for students to understand how two things are both different and alike at the same time.