A) reptiles
B) aves
C) amphibians
D) mammals
Correct Answer: B
Solution :
Birds are uricotelic with metanephric kidney. Urinary bladder is absent in birds. Urine is semisolid in form of uric acid crystals except ostrich and American rhea. Reptiles are creeping amniotic, poikilothermic, tetrapod vertebrates. Kidney is metanephric. Excretory product is uric acid in terrestrial forms and urea in aquatic forms. Amphibians are first tetrapod with two pairs of pentadactyl limbs. Excretory organs include one pair of mesonephric kidney and urinary bladder opens through the cloaca. Mammals evolved from theropsid reptiles during Triassic period. Kidneys are metanephric and bean shaped. Nephron has ?U? shaped loop of Henle. Urinary bladder is present and chief excretory product is urea.
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