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Like sponges and cnidarians, flatworms and roundworms get oxygen and get rid of carbon dioxide by

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leavemealone1914

Answer:

directly through their cuticle, which is permeable to both gases. Once oxygen has crossed into their bodies, it diffuses throughout the tissues.

26bcrawford

Answer:

directly through their cuticle, which is permeable to both gases. Once oxygen has crossed into their bodies, it diffuses throughout the tissues.

Explanation:

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