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

This activity (located on page 3 of the PDF under GPS: Alligator Habitat Activity) is a full inquiry investigation into organisms and the health of their ecosystems.

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.

Combine math and exercise with this activity. Learners count how many times in a row they can skip rope or throw and catch a ball.