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the planarian digestive system is incomplete (it doesn't end up in an anus) while the earthworm digestive system is complete (it runs from the mouth to the anus).
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Description of an earthworm?
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What are the two big dots on a planarian's head?
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What is the difference between alimentary canal and digestive system?
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How is the digestive system of a earthworm similar to humans?
can u tell me
