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BookmarkDigestion is the process whereby a biological entity processes a substance, in order to chemically convert the substance into nutrients.
Digestion occurs at the multicellular, cellular, and sub-cellular levels.
Digestion usually involves mechanical manipulation and chemical action.
In most vertebrates, digestion is a multi-stage process in the digestive system, following ingestion of the raw materials, most often other organisms.
The process of ingestion usually involves some type of mechanical manipulation..
For more information about the topic Digestion, read the full article at Wikipedia.org, or see the following related articles:
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Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Digestion at Wikipedia.org. See the Wikipedia copyright page for more details.
