Allergies result when the immune system: responds to harmless nonself molecules and cells. responds to self molecules and cells. responds to harmful nonself molecules and cells. does not respond to self molecules and cells.

Allergies result when the immune system: responds to harmless nonself molecules and cells.

Allergies occur when the immune system makes inflammatory responses to harmless antigens. Common causes include pollens, dust mites, molds, some foods like peanuts, insect stings, and a few medications.

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the dark variety, as they are not visible on the dark tree barks

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