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miss Akunina [59]
3 years ago
15

PLEASE HELP!!

Health
1 answer:
professor190 [17]3 years ago
4 0

Answer:

Explanation:

Allergies are abnormal immune system reactions to things that are typically harmless to most people. When a person is allergic to something, the immune system mistakenly believes that this substance is harming the body.

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