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The atmosphere provides the biosphere with necessary gases to live and breathe. this is an example of how earth's spheres are .
answered
Apr 3, 2017
Physics
high-school
5
votes
204k
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What is the ratio of 9/36
answered
Oct 21, 2016
Mathematics
middle-school
5
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207k
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How many valence electrons does Arsenic have?
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Jul 15, 2016
Chemistry
high-school
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106k
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