The Effect they have on the environment
The effect they have on the environment, is that they keep the air clean from pollution, the restaurnts that we eat at
by doing inspections, the swimming pools that we swim in free of algae and other bacteria.
http://static.howstuffworks.com/gif/swimming-pool-intro.jpg
http://www.city.charlottetown.pe.ca/images/contentImages/restaurants.jpg
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