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dtaz123 dtaz123
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6 years ago
Caffeine is one of three naturally occurring compounds known as the __________.
 
  a. theobromines
  b. methylxanthines
  c. endorphins
  d. tricyclics
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BRaines92BRaines92
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6 years ago
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dtaz123 Author
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6 years ago
Smart ... Thanks!
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Yesterday
this is exactly what I needed
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2 hours ago
Thanks for your help!!
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