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Which sphere is NOT a part of the cycling of oxygen through Earth's systems? A. biosphere B. exosphere C. atmosphere D. hydrosphere

2 Answers

7 votes

Answer:

exosphere

Step-by-step explanation:

answered
User Spunge
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4 votes
Exosphere is the answer . I have done this lesson in my physics class it's exosphere.
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User Pharaun
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