The excretory system removes metabolic wastes from the blood and to eliminate it from the body. CO2 is a metabolic waste but lungs remove most of it. The __________________ are the major excretory organs that lie on either side of the spine, against the dorsal body wall. After forming urine, they send it to the ____________________________________ and then to the __________________ (urine and digestives wastes are eliminated here) using two small tubes called __________________.

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