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What are most upper respiratory illnesses caused by? O bacteria O allergies O viruses mucus
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5 votes
What are most upper respiratory illnesses caused

by?
O bacteria
O allergies
O viruses
mucus

User Joe Savona
by
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2 Answers

2 votes
The most upper respiratory illnesses are caused by bacteria
User Chong Luo
by
4.8k points
0 votes

Answer:

virus

Step-by-step explanation:

User Qarl
by
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