Alimentary canal (digestive tract) | In animals the alimentary canal (digestive tract) is a tubular organ divided into zones specialised for the ingestion, digestion, absorption and assimilation of food, and also the elimination of indigestible materials. In the majority animals the tract has two openings: the mouth for intake of food and the anus for elimination of waste products. However, some simpler animals such as cnidarians (e.g. hydra and jellyfish) and flatworms have only one opening which serves both functions.
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