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This idea for a dichotomous key activity came to me after endless web searches for useful keys in my fifth grade science classes. The basis behind this key is a series of do-it-yourself, three-dimensional faces that represent fictional “Foiltron” figures. The key has variants for shape (rectangular prism or cylindrical), eyes (one, two, or none), hair (bald or hairy), hair length (long or short), hair color (red, black, brown, or blue), mustache (present or absent), and teeth (showing or not showing). In all, there are more than 200 species for students to design or discover.
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