This Levers and Wedges in the Human Body lesson plan also includes:
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Young biologists identify parts of the body that serve as wedges (teeth and fingernails), and as levers (jaw, arms, and legs). The hands-on activities described here should be exciting for learners to perform, and should also lead to a greater understanding of how our bodies really are examples of simple machines in many ways. This resource has some of the better worksheets I've seen embedded in a lesson.