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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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In this activity, learners explore a bucket of sand and beach objects.

$1 - $5 per group Ages 4 - adult 10 to 30 minutes