Question

what is allergy ? define allergens
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Answer 1

Answer:

The definition of allergy. Allergy occurs when a person reacts to substances in the environment that are harmless to most people. These substances are known as allergens and are found in dust mites, pets, pollen, insects, ticks, moulds, foods and some medications.

Explanation:

Answer 2

$\huge\underline \color{gold}ANSWER$

An allergy is an abnormal reaction by the immune system against a foreign particle that comes in contact with our body.

An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. Such reactions are called allergies.