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B
Testes
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C
Ovary
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D
Kidney
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Solution
The correct option is D Kidney The basic functional unit of the kidney is the uriniferous tubule. This is a continuous tubule, which can be divided into a nephron (3 to 4 cm in length) and a collecting duct (2 cm long).
Each collecting duct receives urine from several nephrons and carries the urine through a renal pyramid to the renal pelvis.