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In this activity, learners "go fishing," then practice ruler use and size/pattern comparison with the animals they catch.

In this activity (on pages 18-28), learners explore how the shape of seeds affects how they are dispersed by wind, birds, ocean currents and other means.

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.