Gastrointestinal tract (digestive tract) generally can be divided into 2 style.5.1 gastrointestinal incomplete (incomplete digestive tract) is a gastrointestinal tract of animals with the mouth but no anus. A passage or food out the same way or gastrointestinal tract a bag (one-hole-sac), including the hydra, jellyfish, fallacy.5.2 gastrointestinal completely (complete digestive tract) is a gastrointestinal tract of animals with both the mouth and anus or channel entrance of food in a different direction. A hollow tube or gastrointestinal (two-hole-tube) the nematode worms to vertebrates.
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