What term describes animals that regulate their body temperature internally?
Endotherms
Endotherms is correct.
Endotherms (often called warm-blooded animals) generate heat inside the body through metabolism and keep their body temperature nearly constant regardless of the surroundings. Birds and mammals, including humans, are endotherms; they use mechanisms such as sweating, shivering, panting and insulation by fur, feathers or fat.
Ectotherms (cold-blooded animals such as reptiles, fishes and most amphibians) depend on external heat sources and their body temperature changes with the environment.
Amphibians are a class of vertebrates (frogs, toads, salamanders) and are themselves ectothermic, while invertebrates are animals without a backbone; neither term describes internal temperature regulation.
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