Mostly through your kidneys that use it to filter your blood and other physiological processes that you don’t really notice. One example are mucose membranes ( you could have heard of them while talking about upper respiratory system issues ), their job is to protect the tissues from drying out by secreting mucus, and mucus is in part made by water. Digestion as well as absorbtion of nutrients require water too.
When they say that water is life, it’s actually true, most if not virtually any organism and their internal processes to survive require some water to get done.
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