Explain why water loss through the lungs and skin cannot be precisely controlled.

Water loss through the lungs and skin cannot be precisely controlled because it is influenced by environmental factors such as temperature and humidity. For instance, during exercise or in hot conditions, the body loses more water through sweat and respiration to regulate temperature, making it difficult to maintain a constant level of water loss.

This answer is strong because it addresses the influence of external factors on water loss, demonstrating an understanding of the physiological processes involved. The question tests the student's ability to explain the complexities of water regulation in the body.