Which are structures of the excretory system? Choose four correct answers.

The excretory system removes wastes from the blood and carries urine out of the body. The kidneys filter the blood and make urine, which travels through the ureters to the bladder for storage and leaves the body through the urethra. The esophagus carries food to the stomach, and the spleen is part of the immune and circulatory systems, so neither is one of these urinary structures.

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