pollen |
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navigate by keyword : air airborne allergen allergic allergies allergy asthma background biology care close concept conceptual count cross dimensional ecological ecology exposure fever flowering forecast grains group hay health human immunology microscopic nature particle plant pollen pollination powder reproduction rhinitis risk science seasonal seed three white |
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Pollen grains concept as a group of microscopic organic pollination particles of flowering plants flying in the air as a health care symbol of seasonal allergies and suffering from hay fever allergy. |
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