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In this activity, learners test exhaled breath for carbon dioxide and learn how to use an indicator as a simple way to measure pH.

In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream.

In this activity, learners discover if carbon dioxide has an effect on temperature.

This activity teaches combustion as the interaction of a fuel source and oxygen.

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.

In this activity, learners act out the flow of blood in the human body! A great way to get learners up and moving while learning about the circulatory system.