General Science • BiologyHard
What is the principal nitrogenous waste excreted by terrestrial mammals, synthesized in the liver through the ornithine cycle from excess amino acids?
A. Uric acid
B. Urea✓ Correct Answer
C. Ammonia
D. Creatinine
💡 Solution & Explanation
Mammals convert toxic ammonia into urea via the urea cycle in the liver, allowing safe excretion in aqueous urine with moderate water conservation. Birds and reptiles excrete uric acid to conserve maximum water, while aquatic organisms excrete highly soluble ammonia directly. Humans filter urea continuously through renal glomeruli.
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