<p>Lungs take oxygen from the air and send carbon dioxide out through the air. </p><p>Gills take oxygen out of the water and let water carry away carbon dioxide. Fish force water through their gills, where it flows past lots of tiny blood vessels.</p>

What do the gills of a fish do?

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How do a fish's gills work? - Highlights Kids

What do the gills of a fish do?

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