Birds excrete uric acid as a semi solid paste because uric acid
- A. is almost insoluble in water, so very little water is lost
- B. is highly soluble in water
- C. is converted to urea in the cloaca
- D. is released as a gas
Explanation
Precipitating uric acid saves water and keeps the egg clean, since an embryo sealed in a shell cannot dilute soluble wastes. Both advantages explain why birds and reptiles chose this route.
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