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    Exam 21: Movement of Elements in Ecosystems
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    Current Atmospheric Carbon Dioxide Levels Are Approximately
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Current Atmospheric Carbon Dioxide Levels Are Approximately

Question 48

Question 48

Multiple Choice

Current atmospheric carbon dioxide levels are approximately


A) 256 ppm.
B) 410 ppm.
C) 394 ppm.
D) 385 ppm.

Correct Answer:

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