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Fish Theory

About Fish

Red-breasted Tillapia

Fish Description of a fish A fish is a cold-blooded (endothermic) vertebrate animal, living in water, breathing by means of gills, and having fins for stability and movement. Fish are by far the most numerous and diverse group of vertebrates. History and classification Fish date back 500 million years ago and are the ancestors of amphibians, reptiles, mammals and birds. …

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