Vertebrates have similar organ system
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vertebrates have many other complex organ systems including a closed circulatory system with a ventral (bottom side) heart having two to four chambers, a respiratory system, a well-developed muscular system with a muscular mouth and pharynx, an excretory system, and an immune system.
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vertebrates have many other complex organ systems including a closed circulatory system with a ventral (bottom side) heart having two to four chambers, a respiratory system, a well-developed muscular system with a muscular mouth and pharynx, an excretory system, and an immune system.
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