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Northern lights or auroras can be seen within the _____ sub-layer. A.ozonosphere B.ionosphere C.exosphere D.troposphere
asked
Jul 18, 2017
Biology
high-school
2
answers
4
votes
45.7k
views
What type of organism is able to cause an infection? a. virus b. archaea microbe c. liver cells d. bacteria
asked
Mar 11, 2017
Mathematics
high-school
2
answers
1
vote
225k
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