Which of the following are signs of dehydration?

The signs of dehydration include thirst, dry mouth, fatigue, and dark urine because these symptoms are the body's way of indicating a lack of adequate fluids. When a person is dehydrated, the body signals thirst as a response to the necessity for more water. A dry mouth occurs due to insufficient saliva production, which is often a direct result of decreased fluid levels. Fatigue can manifest because dehydration impacts overall bodily functions and energy levels, leading to a general sense of tiredness. Dark urine is also a key indicator of dehydration, as it typically signifies that the kidneys are conserving water, resulting in a more concentrated urine color. Recognizing these signs is crucial for maintaining proper hydration and health, especially for individuals engaging in physical activities.