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Biology Junction
Cellular Structure
The human body contains more than 200 types of cells, and plants contain many other unique types of cells. While a huge variety of cells exist, they appear to have very similar structures. A detailed presentation describes the structure...
CK-12 Foundation
Ck 12: Life Science: 11.18 Digestive System Enzymes
Learn how the enzymes in the digestive system help with the digestive process in the human body.
CK-12 Foundation
Ck 12: Life Science: 11.19 Digestive System Bacteria
Find out how bacteria in the digestive system works to digest food.