The correct option is D All of the above
Birds and reptiles are uricotelic. In order to conserve water, they turn the waste into the semi-solid paste, which is uric acid. Uric acid requires less amount of water and as it is less toxic. It can be stored for longer duration in the body. Many snakes, crocodiles, birds and most lizards lack a urinary bladder. So, the correct answer is option D.