what is perennial allergy?
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Perennial allergies are often a reaction to house dust. House dust may contain mold and fungal spores, fibers of fabric, animal dander, dust mite droppings, and bits of insects. Substances in and on cockroaches are often the cause of allergicsymptoms.
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perennial energy is related with the extraction,compression and transportation of biogas
tisha72:
sorry
i thought its energy
orry
sorry
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