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This interactive module allows students and educators to build models that explain how the Earth system works. The Click & Learn can be used to show how Earth is affected by human activities and natural phenomena.

A number of questions are embedded within the short film Popped Secret: The Mysterious Origin of Corn, which explores the genetic and archaeological evidence that corn was domesticated from a wild Mexican grass called teosinte.

This tutorial describes how animals differ in their abilities to heal wounds and regenerate lost body parts or damaged tissues.

This tutorial explores how stem cells can be used to treat a wide range of diseases.

This short tutorial explores and compares the mechanisms of artificial selection and natural selection.