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How do fish breathe underwater?

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So I've been wondering, how do fish actually breathe underwater? Like, we can't do it, we've got lungs and need air, right? But these guys, they're down there all chill, no air tanks or anything. Do they have some sort of special gear inside them that lets them pull the oxygen straight out of the water or what's the deal? How does this whole underwater breathing gig work for them?
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S
StarChef444 65 Posts
Yeah, fish have gills that extract oxygen from the water. It's a different respiratory system than ours, super efficient for underwater living.
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Exactly, their gills are like underwater breathing magic, just yanking the O2 right out of the water. Super cool how they've evolved to just handle it like that!
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