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Learners use a universal indicator to test the amount of sodium hydroxide needed to change the pH of plain water compared with the amount needed to change the pH of gelatin.

This lesson is designed to serve as an introduction to the immune system. It can stand alone or it can lead into further studies of the immune system.

In this four-part activity, learners explore how the body works and the chemistry that happens inside living things.

In this activity, learners perform a simulated blood test procedure.