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Which of the following body systems do both roundworms and flatworms have?

1.Digestive
2.Circulatory
3.Endocrine
4.All Of The Above

User XCool
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2 Answers

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All roundworms and flatworms have a digestive system. 
User Meti
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They have all of the above. All living things need an endocrine, circulatory and digestive system to live. 
User Kimsk
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