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In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to breathe.

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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In a series of three experiments, learners explore the basics of biotechnology using self-locking plastic baggies. Each experiment demonstrates a phenomenon or principle of biotechnology.

Over $20 per group Ages 14 - 18 4 to 24 hours