★ Excretion Quiz
Mammals have evolved a sophisticated mechanism for eliminating nitrogenous waste that involves:
A. secretion through cell membranes
B. forming urea and storing it in concentrated solution
C. producing uric acid and excreting it with feces
D. recycling urea and using it as an energy source
Preview next quiz:
What method of transport does water get reabsorbed into the blood at the PCT
A. Osmosis
B. Diffusion
C. Active transport
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