Answer:
(d) Nephrons are
the filtration units of kidneys, it is the structural and functional unit of a kidney
and has three functions - filtration, reabsorption and secretion. Urine from
the kidney passes through a tube called ureter, that carry urine into the
urinary bladder.
The urethra is a
canal that carries urine from bladder and expels it out of body. Neurons are the
nerve cells and are functional units of nervous system.
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