Answers by Thao Ngo
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Answers by Thao Ngo

Answers by Thao Ngo
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In order for a physical barrier to be effective in preventing infection, the barrier must __________.
answered Jan 9, 2017
5 votes
234k views
Can you identify the 4th most abundant element in the universe?
answered Jan 18, 2015
2 votes
155k views
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