1) Excretory substance removed through sweat. a) Carbon dioxide b) Salts and water c) Uric acid 2) Tube that carries urine from the kidney to the bladder. a) Urethra b) Urinary bladder c) Ureter 3) The blood vessel that carries excess amino acids from the intestine to liver. a) Renal vein b) Hepatic portal vein c) Hepatic portal artery 4) The nitrogenous waste product excreted by amphibians. a) Urea b) Uric Acid c) Ammonia 5) The organ that filters blood and produces urine. a) Urinary bladder b) Kidney c) Liver 6) The part of human excretory system that allows urine to exit the body. a) Ureters b) Urinary bladder c) Urethra

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