Answer:
Fish go blub blub
OK but in all seriousness, the word "fish" is such a basic term everybody just KNOWS so I can understand why you might have trouble on it.
Fish belong in the kingdom Animalia and are vertebrates.
Common traits of fish is that they live in water I. E. Lakes, rivers, and oceans. (it depends on they're body and their system. You can release a porcupine fish into a lake.) they will generally have scales to move in the water swiftly and their respiratory organs are gills.
