Birds excrete a semi-solid, white coloured substance consisting of _________.
Options:
A .  
bile
B .  
ammonia
C .  
urea
D .  
uric acid
Answer: Option D : D Nitrogenous wastes in birds is excreted as a semi-solid, white coloured substance composed of uric acid. The excretory product in humans is urea. The excretory product in fishes is ammonia.
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