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Well,Fish Can Breathe Under water because, First of all fish are not mammals,and fish are put in their own group because fish have gills that give them the ability to breathe underwater. Mammals(Humans) have lungs that allow us to breath oxygen.Humans can be underwater for a short period of time because people hold their breath for short period of time.

But the answer is gills because instead of breathing oxygen, gills are made for breathing underwater,just like fish!If you catch a fish,when you take it out of the water it starts to flap,and then if you keep it out long enough,The fish will stop breathing because fish are not made for breathing air,Just like a fish gills.

I hoped this Helped!

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13y ago

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