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3. The formation of disinfection byproducts requires the presence of organic matter. Therefore, Tucson's water will contain __________ byproducts, compared with many other regions.

  1. More
  2. Less

B - Tucson's water will contain less disinfection byproducts compared with many other regions. This is because Tucson's water is pumped from beneath the ground where little or no organic matter exists. Organic matter comes from living organisms like bacteria and algae which require oxygen, nutrients, and sunlight to live.


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