Kidneys are thought to have evolved first among the ________.
A)amphibians
B)freshwater bony fishes
C)saltwater bony fishes
D)reptiles
E)mammals

Name: Kidneys are thought to have evolved first among the ________. A)amphibians B)freshwater bony fishes C)saltwater bony fishes D)reptiles E)mammals
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Kidneys are important for freshwater bony fishes to maintain osmotic balance with the surrounding water. This suggests that kidneys evolved first among these fishes, before amphibians, reptiles, and mammals.

Kidneys Are Thought to Have Evolved First Among the ________