Biology

The correct answer is: A.by retaining water

Explanation:

1.Uric acid is excreted by reptiles and birds as a solid to conserve water. Unlike urea (which is water-soluble), uric acid is relatively insoluble in water and can be excreted as a paste or solid, minimizing water loss.

2.In hot climates, conserving water is crucial for survival, especially since these animals often live in environments where water is scarce. By excreting waste in the form of uric acid, they avoid losing large amounts of water through urine, thus helping maintain internal homeostasis by retaining more wa...