Pollen or aero allergens enter the atmosphere from
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most of the allergens come from trees,weeds and grasses or we can say flowers also.
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Explanation:
Pollens or aero allergens enter to the atmosphere through trees, Grass and weeds.
Pollen can be referred as the male gamete of plant that can travel through several medium i.e. water, air etc. for fusing with female gamete of a different plant to form a zygote.
The pollens are very small and enter into respiratory tract of humans and create allergies.
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