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Mold Growth
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In this activity learners observe mold growth on different types of bread by measuring and recording the growth rate.
Ripening of Fruits and Vegetables
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In this activity, learners test the rate of ripening fruit and vegetables and use a chemical to inhibit the ripening process.
How Long Can You Hold Your Breath?
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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.