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This PBS site has an excellent flash animation of the molecules involved in photosynthesis and how they travel from human to plant to atmosphere.

Superb animation on photosynthesis for high schoolers. The atoms and molecules the site shows would be confusing to lower grades.

This website contains key terms to understanding about plant reproduction with emphasis on anatomy.

Is an "investigation" into plant hybridization.

This is a quiz to test the students understanding of a video on the effects of pesticides.

A detailed summary of the nitrogen cycle with diagram.