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This lab activity is about toxic substances like pesticides and their effects on biological systems. The activity starts with an introduction of how birds sequester calcium to make an egg.

$10 - $20 per group Ages 14 - 18 1 to 7 days
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Ocean acidification is a big issue due to the amount of carbon dioxide humans release. CO2 in the atmosphere is absorbed into the ocean thus changing its acidity.

$1 - $5 per student Ages 11 - 18 10 to 30 minutes