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According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere. Which statements explain how this change occurred and how it affected life on
asked
Mar 4, 2017
Biology
middle-school
1
answer
2
votes
114k
views
How does an adult hydra produce a new hydra?
asked
Apr 24, 2016
Biology
high-school
2
answers
0
votes
150k
views
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