Concentration of urea is minimum in

Options :
  1. pulmonary vein
  2. hepatic artery
  3. portal vein
  4. renal vein
Answer and Explanation :-

Answer: Option 4

Explanation:

Because it carry blood from kidney to heart after filtration of blood.

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We have become, by the power of a glorious evolutionary accident called intelligence, the stewards of life's continuity on earth. We did not ask for this role, but we cannot abjure it. We may not be suited to it, but here we are.
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