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Ptelwa Ptelwa
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6 years ago
Fluoride is naturally found at varying concentrations in all drinking water.
 
  Indicate whether the statement is true or false
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JMENDEZJMENDEZ
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6 years ago
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Ptelwa Author
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6 years ago
This site is awesome
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Good timing, thanks!
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2 hours ago
You make an excellent tutor!
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