3. The formation of disinfection byproducts requires the presence
of organic matter. Therefore, Tucson's water will contain __________
byproducts, compared with many other regions.
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.
Environmental Health Sciences Center
University of Arizona College of Pharmacy, Room 244
PO Box 210207, Tucson, AZ, USA 85721-0207 email@example.com