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In this activity, learners observe the effect of transpiration as water is moved from the ground to the atmosphere.

In this environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth.

In this environmental science lesson, learners will examine hazardous chemicals and their effects on human health and the environment.

In this activity about daily rhythms (on page 17 of the PDF), learners will explore circadian patterns in humans, animals and plants.