How Do Fish Breathe?

A fish is a vertebrate which means it has a bony skeleton with a backbone. It's a vertebrate that lives in the water. They don't have lungs, but they do need oxygen to run their cells. But fishes have a very frilly, complicated blood enriched gill sort of filament. And you've seen them on an axolotl. So this is a very, I mean going back to like when you were a kid and you were marveling at the tank, this is such a basic question. How do fish breathe? It is, that's not a basic question,. It's not complicated.

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