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In this activity, learners explore the concept of permeability to better understand why amphibians are extremely sensitive to pollution.

1 cent - $1 per group Ages 4 - 14 4 to 24 hours
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This activity (on pages 19-25) is about fleas and ticks, which are common pet parasites.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners will discover how the thin layers of amphibians' skin allow water and other chemicals to pass through it.

$1 - $5 per group Ages 6 - adult 1 to 7 days