Final answer:
The excretory system consists of the kidney, bladder, ureter, and urethra.
Step-by-step explanation:
The structures of the excretory system are the kidney, bladder, ureter, and urethra. The kidney filters waste products from the blood, producing urine. The ureter carries urine from the kidney to the bladder, where it is stored before being eliminated through the urethra.
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