October 27, 2025
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How Is Breathing Different in Humans and Fishes? 

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When human beings breathe, they take in oxygen (O2) from the air that travels through the nose, down the windpipe and into the lungs.
How Is Breathing Different in Humans and Fishes? 
When human beings breathe, they take in oxygen (O₂) from the air that travels through the nose, down the wind-pipe and into the lungs. The oxygen passes through the lung membranes into the bloodstream and carbon dioxide (CO₂) flows out from the blood. This carbon dioxide is carried to the lungs,
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