Final answer:
The question seems to be playing with the idea of dwelling or resting places.
Step-by-step explanation:
The phrase 'place for a bird to roost or for a person to sit' doesn't directly refer to 'fish' in biology. A bird roosts in a nest and a person sits on a chair or similar structure. Bony fishes don't have a typical 'seat', but they do have a swim bladder which helps them control their buoyancy. Rather, it seems to suggest a dwelling or resting place.
However, if we take 'fish' to mean a broader category of living organisms, we can talk about different habitats and resting places for different species. Birds roost in nests, which can be located in trees, cliffs, or on the ground, and serve as their dwelling places and the places where they raise their chicks. People typically sit on chairs or other furniture, which can be inside houses, offices, or outdoor places like parks. However, if we joke around, we can say that bony fishes also have a 'seat' in a sense - the swim bladder, which is a gas-filled organ that helps control the fish's buoyancy.
Learn more about Animal Dwellings