Poisons and salts are removed from the blood by the . lungs
stomach
kidneys
skin

Kidneys

Explanation:

The kidneys remove wastes and excess water in the body through the urine, as urine flows from the kidneys to the bladder through two thin tubes located on both sides of the bladder called the ureter, and the bladder stores urine, and each of the kidneys consists of about one million filtering units called the renal tubular unit contains Each renal tubular unit has a filter called the glomerulus and tubule, and the renal tubular unit operates through a two-step process:

glomerulus: filters blood.  

Tubule: Returns the necessary substances to the blood and removes waste.

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