What is an allergen?
A chemical substance released by the immune system in allergic reactions that is responsible for many of the symptoms of anaphylaxis, such as vasodilation
A poison or harmful substance
A raised, swollen, well-defined area on the skin resulting from an insect bite or allergic reaction
A substance that causes an allergic reaction
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Answers on questions: Biology
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Ответ:
1, 2 & 3
Explanation:
short-term energy
make up cell membrane
long-term energy