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killian killian
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Posts: 6024
10 years ago
How did oxygen (O2) get into Earth's atmosphere?
A) It was released by life through the process of photosynthesis.
B) It was captured from the solar nebula.
C) It was outgassed from volcanoes.
D) It came from chemical reactions with surface rocks.
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Staff Member
Educator
10 years ago
AA
Mastering in Nutritional Biology
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killian Author
wrote...
Silver Member
10 years ago
Thank you.
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