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The correct answer is option 3, Sparrow.
Excretion is the process of eliminating waste products from the body. Different organisms excrete different types of waste depending on their metabolic processes.
In this case, Sparrow excretes uric acid as its excretory product. Uric acid is a waste product of metabolism in birds and reptiles. It is primarily composed of nitrogen and is less toxic than other waste products like ammonia. Uric acid is produced by the breakdown of purines, which are components of DNA and RNA. Birds, including sparrows, excrete uric acid instead of urea like mammals do because it requires less water for excretion. Uric acid is concentrated and formed into a paste-like substance, allowing birds to conserve water in their bodies.