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This activity investigates how bark beetles can threaten forests by having learners estimate the number of infected trees from a photo.

In this "gross" activity (on pages 34-46), learners make a life-size model of a human digestive tract, and follow the life of a beef tapeworm as it makes its way through.

This activity (on pages 19-25) is about fleas and ticks, which are common pet parasites.