Fish are a vertebrate class, like mammals, however they are cold-blooded and live in water. Fish are one of the oldest classes of animals, having been on the Earth for more than 500 million years. Additionally, while all fish share the common traits of having a backbone and living in water, they are one of the most diverse classes with about 32,000 different living species (which is more species than amphibians, reptiles, birds, and mammals combined). Due to the unique properties of water to transmit scent, taste, sound, and electricity, many fish have evolved to rely less on their sense of sight and more on their other senses.

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