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Describe how three different organism -human , flatworms and fern obtain the oxygen they need for survival.

Describe how three different organism -human , flatworms and fern obtain the oxygen they need for survival.
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Describe how three different organism -human , flatworms and fern obtain the oxygen they need for survival.

User Jordin
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umm humans breathe pre- produced oxygen made by many bacterias and flatworms and ferns produce oxygen... possibly
User Lokesh Suthar
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