Skin is the Largest barrier agaisnt Pathogens which include Bacteria which cause infections.
traduce esto artículo
http://www1.lsbu.ac.uk/water/cellulose.html
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Evaporation and condensation can be used to purify water because it allows for the dirt and other chemicals that are harmful to be taken out of the water and leave behind a much cleaner and purified water, almost like filtering it naturally.