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This exercise is designed to teach young learners the different parts of a plant (root, stems, leaves, flowers, fruit, and seeds), the basic functions of each part, and to show that tiny microscopic o

In this activity (on pages 26-33), learners play parasitologists, solving several "mysteries" about people who got sick from various parasites. In teams of four, each member solves one mystery.

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

A group of learners simulates the spread of disease by trading slips of paper, one set of which has been treated with a baking soda solution.