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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
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While playing a game, learners discover how the Endangered Species Act works in the United States. Learners move along a game board by answering questions correctly.

1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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In this online game, learners test their skills of categorization.

free Ages 8 - 11 10 to 30 minutes