why do Platyhelminthes have reduced digestive system
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Because they don't have a body cavity, flatworms are considered acoelomates. They have simple digestive systems, with mouths to take in food and long digestive tracts to diffuse it around the body. Most flatworms take in food via their mouth, then move it into a digestive gut that attaches to the digestive structures.
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they dnt have a body cavity
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