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How often does oxygen cycle through the atmosphere? a. about every 1000 years b. about every 1500 years c. about every 2000 years d. about every 2500 years
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How often does oxygen cycle through the atmosphere?

a. about every 1000 years
b. about every 1500 years
c. about every 2000 years
d. about every 2500 years

User Damodar
by
7.5k points

2 Answers

5 votes

B. about every 2000 years


User Ddomingo
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7.8k points
6 votes
about every 2000 years.

User AbdealiLoKo
by
8.8k points
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