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Charra [1.4K]
3 years ago
15

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

Social Studies
1 answer:
IgorLugansk [536]3 years ago
8 0

Answer:

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

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