The body needs to produce urine as a way to discard waste products produced by the body. These wastes are not voluntary, they are side effects of the processes which the body does in order to remain alive. Leaving them inside the body will gradually kill it so removing them is necessary even when water isn’t easily obtained.
When dehydrated the body will make the urine more concentrated, putting more waste into less water which is visible in that the urine will be darker.
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