Uric acid is advantageous for nitrogenous waste excretion in insects because it is insoluble in water and has low toxicity. This allows for the waste to be excreted in a solid form, conserving water and reducing the risk of toxicity. Additionally, producing uric acid costs less energetically than producing ammonia, making it a more efficient method of waste excretion. Therefore, uric acid is a main component of insect urine and is essential for their survival in arid environments where water conservation is critical.