Concept:Urine is more concentrated than blood because the kidneys conserve water while removing waste.
Explanation:In mammals, urine is hypertonic when compared to blood.
This means urine has a higher concentration of solutes than blood plasma.
During urine formation, the nephron reabsorbs a large amount of water back into the bloodstream.
This mainly occurs in the Loop of Henle and the collecting ducts under the influence of ADH.
As water is removed, urea and salts remain in the filtrate.
Therefore, the urine becomes concentrated or hypertonic.
Answer:D. much water has been removed from urine