CK-12 Foundation
Ck 12: Biology: Anaerobic vs Aerobic Respiration
[Free Registration/Login may be required to access all resource tools.] Describes aerobic or anaerobic respiration.
ArtLex
Art Lex: Harmony
This site from Artlex provides a brief but effective definition of the Principle of Design known as Harmony. There are links to other terms within the definition as well as quotations by Cezanne, Seurat and Ingres.
Geography 4 kids
Geography4 kids.com: Earth's Atmosphere
Site studies what air is as well as what composes the atmosphere.
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