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What's in the Water?: Biotic and Abiotic Elements in Aquatic Ecosystems

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In this investigation learners explore the differences between, and interdependence of, living and nonliving elements in a water ecosystem.
$1 - $5 per group Ages 8 - 14 45 to 60 minutes

Tree Poker

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In this activity (p.14-15 of PDF), learners discover the concepts of competition and limiting factors as they relate to plant and animal communities.
$1 - $5 per student Ages 4 - 11 10 to 30 minutes