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Germ Tag
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In this version of tag, a large group of learners model how the body fights infection. Learners act as germs, as lymphocytes, and as the body's cells threatened by germs.
Respiration Relay
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In this physical activity, groups of learners act as blood cells traveling through the circulatory system.
Fill 'er Up!
Source Institutions
Learners discover that their breath contains carbon dioxide, one of the pollutants found in car exhaust.