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.

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

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