Animals with a single opening in the digestive tract have an incomplete digestive system (cnidarians, Platyhelminthes). the digestive tract of animals with a complete digestive system has two openings—a mouth and an anus—instead of one (including all other animal phyla, with the exception of poriferans, which do not have any digestive tract).
Digestion is confused in animals with inadequate digestive systems. The extracellular space is where it starts, and the intracellular space is where it ends. Extracellular digestion dominates in the digestive tract of animals with full digestive systems.
Animals with full digestive systems have an advantage because they can optimize the benefits of digestion and better absorb nutrients.
Peristalsis moves the food in a full digestive tract. The ability to absorb nutrients to their fullest potential is one benefit of having a fully functional digestive system. Two holes instead of one make up the entire digestive tract. All mammals, including bears, squirrels, and dogs, have full digestive systems. Peristalsis moves the food in a full digestive tract. The ability to absorb nutrients to their fullest potential is one benefit of having a fully functional digestive system.
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