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ANKUR ANKUR
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Posts: 841
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6 years ago
The study of ______ shows that there is significantly more carbon dioxide in the earth's atmosphere than at any time in the last 800,000 years.
 
  a. ice core data
  b. earth's electromagnetic field
  c. aurora borealis analyses
  d. coral reefs
  e. ocean temperatures
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6 years ago
a
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