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Biology

pH SCALE
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Useful Links

Enzymes are proteins that help speed up a metaboblic reaction. The following tutorial discusses the struture and functions of enzymes. 

Cellular respiration is a biochemical pathway by which living cells produce energy by breaking down glucose to form oxygen. This videos explains  how cellular respiration uses both anaerobic and aerobic pathways. 

The following video briefly explains how the circulatory system works.