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Name: lennartz
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Question:
How do fish get their oxygen under water?


Replies:
Not so differently from the way we get it from air. Water contains dissolved oxygen, enough of it to support life. It's just a question of extracting it. Gills are specialized structures in which the blood comes into contact with the water over a very large surface area, just like in the lungs, blood comes into contact with the air over a large surface area.

-ProfBill


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