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Question
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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