Answer:
Overreacts to an antigen.
Explanation:
Thats what an allergy is if you think about it
Whether or not the article describes persenal experience is the major determining factor in this question. If the article tells the story of another, it is secondary, if the article was written by someone who is recounting on their experience, it is first peron. Hope this is clear and understandable.
Answer:
because different cell types can perform different functions
3 or 2 1 would not make sense
