Fish are adapted to living in water in a number of ways. First, they have gills that allow them to extract oxygen from the water. These gills are highly efficient at removing oxygen from the water and transferring it to their bloodstream. Second, fish are able to regulate their buoyancy using a swim bladder, which allows them to control their depth in the water column. Third, they are able to maintain their body temperature and electrolyte balance in a variety of water conditions, which allows them to survive in a range of aquatic environments. Finally, fish have evolved a variety of adaptations to help them avoid predators, find food, and reproduce in aquatic environments. While humans cannot live in water, we do have adaptations that...