Which nitrogenous waste product is excreted primarily by birds, reptiles, and terrestrial insects to conserve body water due to its low solubility?

💡 Solution & Explanation

Uric acid is excreted by uricotelic animals such as birds and reptiles as a semisolid paste or white precipitate, which minimizes water loss since it requires minimal hydration for elimination. Ammonia is highly toxic and water-soluble, making it suitable only for aquatic organisms that can dilute it instantly. Mammals convert ammonia into urea, which requires moderate water for excretion through the kidneys. Creatinine is a metabolic waste product of creatine phosphate breakdown filtered by renal glomeruli.