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This activity (on page 3 of the PDF under GPS: Biodiversity Activity) is a full inquiry investigation into biodiversity.

free Ages 8 - 14 1 to 2 hours
Source Institutions
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In this classic activity, learners investigate natural selection by becoming birds foraging for food on an island.

$10 - $20 per group Ages 11 - 18 1 to 2 hours
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This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.

$1 - $5 per group Ages 8 - 14 1 to 2 hours