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Fish are Cold-blooded animals, Vertebrates can be Mammals, Vertebrates can be Reptiles, Vertebrates can be Amphibians, Vertebrates can be Fish, Vertebrates can be Birds, Warm-blooded animals maintain Constant Body Temperature, Heat from Environment, Cold-blooded animals obtain Heat, Heat from Food, Mammals are Warm-blooded animals, Cold-blooded animals maintain Ambient Body Temperature, Amphibians are Cold-blooded animals, Birds are Warm-blooded animals, Warm-blooded animals produce Heat, Reptiles are Cold-blooded animals, Vertebrates have a Complete Digestive System, Vertebrates have a Closed Circulatory System, Vertebrates have a Cephalization, Vertebrates have a Backbone, Vertebrates have a Dorsal Nervous System