Fish gills are shaped like a heart. Not moving water back and forth, as we do with the air we breathe, saves fish considerable energy. The average fish uses muscles to pump water into its mouth and ...

How do fish breathe underwater and the differences between gills and lungs. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Like humans, fish ...

I think the gills allow fish to breathe because water goes in them. Because they have holes in their gills so it is like a nose. But I don’t know how they stay alive if we can’t with our nose. Well if ...