Final answer:
Four common types of allergens are pollen, dust mites, pet dander, and certain foods.
Step-by-step explanation:
Four common types of allergens include pollen, dust mites, pet dander, and certain foods.
Pollen is a fine powder produced by plants and is a common allergy trigger, especially during spring and summer.
Dust mites are tiny insects that live in bedding, upholstered furniture, and carpets, and their droppings can cause allergic reactions.
Pet dander refers to the flakes of dead skin, hair, or feathers shed by animals like cats, dogs, and birds, which can trigger allergies in sensitive individuals.
Certain foods like peanuts, tree nuts, milk, eggs, shellfish, and wheat can also be allergens and lead to allergic reactions in some people.
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