Final answer:
The pair of organs that is not found in the given list is the ureters.
Step-by-step explanation:
In the given list, URETERS is the correct answer as a pair of ureters are not present. Lungs, urinary bladder, and kidneys are all organs that exist in pairs. The lungs are a pair of respiratory organs responsible for gas exchange, the urinary bladder is a pair of organs that store urine before it is eliminated, and the kidneys are a pair of organs that filter waste from the blood and produce urine.
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