Definition
A fish is a cold-blooded aquatic vertebrate with gills and fins. Fish live in water and breathe using gills to extract oxygen. They come in a vast array of shapes, sizes, and colors. They can be found in both freshwater and saltwater environments. Fish play a crucial role in aquatic ecosystems as both predators and prey. They are a major food source for humans and other animals. Fish are incredibly diverse, demonstrating impressive adaptations to their specific habitats.