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Responses of the immune system to usually harmless environmental substances are known as (1) antigen production (2) chromosomal mutations (3) pathogens (4) allergies
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Responses of the immune system to usually

harmless environmental substances are known as
(1) antigen production
(2) chromosomal mutations
(3) pathogens
(4) allergies

User Lannette
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1 Answer

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The immune system over-reacts to normally harmless substances, the name of a substance or substances that cause these over-reactions are called allergies
User Slvn
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