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In this activity (on page 2 of the PDF under GPS: Cactus Activity), learners will develop their own version of a tool used by biologists, a dichotomous key, by collecting all their left shoes.

In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.

In this activity, learners calculate the number of milliliters of water a nearby tree transpires per day.

In this very hands-on lesson, learners will investigate dendrochronology (the study of tree rings to answer ecological questions about the recent past) and come up with conclusions as to what possible