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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.

free Ages 8 - 14 10 to 30 minutes
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Learners work in teams to investigate how scientists use physical characteristics to classify living things.

free Ages 8 - 18 45 to 60 minutes