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Excretory System, bladder to urethra, liver to urea (by most organisms), ureter to bladder, a body system by which waste products from metabolism such as carbon dioxide, liver to uric acid by organisms in water scarce habitats, nitrogen compounds such as ammonia, ammonia is converted in the liver, ammonia is poisonous, a body system by which waste products from metabolism such as nitrogen compounds, a body system by which waste products from metabolism such as water