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it is the thick column of nerve tissue that extends from the base of the brain about two thirds of the way down the backbone
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the portion of the alimentary canal extending from the stomach to the anus
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a blood vessel that carries blood away from the heart
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it is the mass of nerve tissue located in the head of animals with spinal cords; it is the center of thought and controls movement
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it is the organ that controls the flow of blood in the body
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a blood vessel that carries depleted blood back to the heart
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