In case if one of them fails there's another one to perform assigned function.
the kidneys is the pair of organs that filters blood - the spleen and liver also play a role.
The organs are simply called the Kidneys
Kidneys, lungs
In males, the pair of reproductive organs is the testes, which produce sperm cells and the hormone testosterone. In females, the pair of reproductive organs is the ovaries, which produce egg cells and the hormones estrogen and progesterone.
Kidneys are often described as bean shaped.
From its Wikipedia page: "Krill are often referred to as light-shrimp because they can emit light, produced by bioluminescent organs. These organs are located on various parts of the individual krill's body: one pair of organs at the eyestalk, another pair on the hips of the second and seventh thoracopods, and singular organs on the four pleonsternites."
It one of a pair organs in the human body they helps with filtration mostly.
The urinary system, also known as the renal system, consists of the kidneys, ureters, bladder, and the urethra.
there is only 1 pair of organs that regulates anything, the kidneys.
Gas exchange is accomplished by pair of bipectinate, nonciliated gills.
An amphid is one of a pair of chemosensory sense organs positioned laterally on the head of a nematode.
That pair of organs is called as kidneys. They are placed besides your vertebral column in the abdomen. Kidneys filter about 180 liters of fluid per day. About 177 to 178 liters of the fluid is absorbed back. Rest is excreted as urine.