A chordate is an animal belonging to the phylum Chordata. These animals are characterized by the presence of a notochord (a flexible, rod-shaped structure), a dorsal hollow nerve cord (a nerve cord running along the back), pharyngeal slits (openings in the throat region), and a post-anal tail at some point in their development. Chordates encompass a vast array of organisms, from simple tunicates to complex vertebrates like mammals, birds, reptiles, amphibians, and fish. The notochord provides skeletal support, the nerve cord facilitates neural communication, the pharyngeal slits are often involved in filter feeding or respiration, and the tail aids in movement. The chordate body plan represents a significant evolutionary advancement, enabling diverse adaptations and ecological niches.
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