• Animals (Kingdom Animalia)

• Chordates (Phylum Chordata)

• Vertebrates (Subphylum Vertebrata)

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Subphylum Vertebrata comprises the vertebrates, a highly successful and diverse group of chordate animals distinguished by the presence of a vertebral column (backbone) and a well-developed cranium (skull) that protects the brain. Vertebrates include fishes, amphibians, reptiles, birds, and mammals, ranging in size from tiny minnows and frogs to giant whales. They possess complex organ systems, an internal skeleton of bone or cartilage, advanced sensory organs, and a centralized nervous system that enables sophisticated behaviors and adaptations. Vertebrates inhabit virtually every environment on Earth, including oceans, freshwater systems, forests, grasslands, deserts, polar regions, and the atmosphere.