Answer:
Airborne allergens, such as pollen, dust mites, mold spores, pet dander or particles of cockroach waste. Respiratory infections, such as the common cold. Physical activity. Cold air
Explanation:
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Answers & Comments
Answer:
Airborne allergens, such as pollen, dust mites, mold spores, pet dander or particles of cockroach waste. Respiratory infections, such as the common cold. Physical activity. Cold air
Explanation: