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In this activity, learners work in teams to study the observation skills essential to scientific research.

In this online interactive, learners use fossils to infer temperatures 55 million years ago, at the sites where the fossils were found.

In this activity, learners conduct an experiment to explore how water flows up from a tree's roots to its leafy crown.

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