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Chordates
A phylum of animals that share a common characteristic of having a notochord at some stage of their development.
Brain
The central organ of the human nervous system, responsible for processing sensory information, regulating bodily functions, and facilitating cognition.
Spinal Cord
A long, thin, tubular structure made up of nervous tissue, which extends from the brainstem down the back, and transmits nerve impulses between the brain and the rest of the body.
Common Ancestor
Forebear of two or more lineages or family groups; ancestral to both groups.
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