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GOOD2Know17 GOOD2Know17
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6 years ago
A key characteristic of aquatic dead zones is ________.
 
  A) a high concentration of organisms resulting in extreme competition and finally the death of most
  B) a low concentration of nitrogen and phosphorus nutrients
  C) a low concentration of keystone species
  D) a low concentration of oxygen
  E) a high concentration of urban development
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6 years ago
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6 years ago
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