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    Lawrence Hall of Science
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    In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count. In a process similar to that used by real field biologists, learners count...

    $10 - $20 per group Ages 8 - 14 45 to 60 minutes
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    University of Nebraska State Museum
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    In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling. Learners...

    $1 - $5 per group Ages 8 - 14 1 to 2 hours
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    Lawrence Hall of Science
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    In this online activity, learners "map" certain plants they have seen near where they live. Learners electronically submit data on whether they have seen trees with leaves, trees with...

    free Ages 4 - 11 5 to 10 minutes
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    Twin Cities Public Television
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    This activity (located on page 3 of the PDF) is a full inquiry investigation into organisms and the health of their ecosystems. Groups of learners will net and count different types of...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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    Children's Museum Of Houston
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    In this activity, learners practice counting and multiplication as they figure out how many animal body parts they have to examine as "Dr. Vet."

    1 cent - $1 per group Ages 4 - 8 10 to 30 minutes