Fish are members of poikilothermic (cold-blooded) vertebrates that live in water and breathe through gills. Fish are the most diverse group of vertebrates with more than 27,000 species worldwide.

Fish are members of poikilothermic (cold-blooded) vertebrates that live in water and breathe through gills. Fish are the most diverse group of vertebrates with more than 27,000 species worldwide.

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Stock photo: Fish are members of poikilothermic (cold-blooded) vertebrates that live in water and breathe through gills. Fish are the most diverse group of vertebrates with more than 27,000 species worldwide. was taken by solehhudindin .