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In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

In this multi-faceted game (on pages 25-35), learners recreate what happens to creatures in the Brazilian rain forest as they grow from egg to adult—especially those that use fallen, empty Brazil nut

In this outdoor activity, learners plan a simple foot path and create an environmental impact study of the natural area where the path would be.