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  3. Unit 3. ecology
  4. Ecosystems
  5. Biogeochemical cycles

6.3 Biogeochemical cycles  (Page 10/26)

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10 / 26  Carbon is present in the atmosphere as ________.
A  carbon dioxide
B  carbonate ion
C  carbon dust
D  carbon monoxide
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Practice MCQ 6 FlashCards 3 Key Terms 9

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Source:  OpenStax, Biology-bossier parish community college. OpenStax CNX. Jan 06, 2014 Download for free at https://legacy.cnx.org/content/col11590/1.4
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