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Breathing Yeasties
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In this life science activity (page 8 of the PDF), learners explore the carbon cycle by mixing yeast, sugar and water.
Fuel for Living Things
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In this activity, learners observe what happens when yeast cells are provided with a source of food (sugar). Red cabbage "juice" will serve as an indicator for the presence of carbon dioxide.
It's a Gas, Man
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In this activity, learners discover if carbon dioxide has an effect on temperature.