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Millions of organisms can live in and around a body of water.

In this activity, learners build penetrometers to test leaf toughness. Biologists measure leaf toughness to study the feeding preferences of insects and bugs.

Learners use a variety of beans to represent a variety of species, and scatter these beans over a large piece of paper representing the environment.

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

This activity (located on page 3 of the PDF under GPS: Temperate Rain Forest Activity) is a full inquiry investigation into tree growth rates.

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