Filtration takes place because it occurs as a process to remove particles from water. It depends to where it is being processed. For water filtration, its primary use is to filter unwanted organisms and purify the water. It also occurs in the human body where blood is filtered by nephrons to remove excess fluid and waste products.
Its illegal, 21 is the legal drinking age
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A stereotype is like, for example, if it was your first time eating apples, and you had 100,000 apples in a field, and you tasted one bad apple, then you would think that all apples taste horrible. "All apples are bad." Would be a stereotype because not all of the apples were bad, you just tasted one bad apple.