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What type of barrier are coughing and sneezing?
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1 vote
What type of barrier are coughing and sneezing?

User Karlth
by
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2 Answers

1 vote
physical i think

i hope this is what you are looking for.
User Stefaan
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8.1k points
2 votes
I would say physical though. 
User Joyce
by
8.3k points
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