Answer:
Sinus infections happen when fluid builds up in the air-filled pockets in the face (sinuses), which allows germs to grow. Viruses cause most sinus infections, but bacteria can cause some sinus infections.
Explanation:
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Answer:
Lymphocyte
Explanation:
A type of white blood cell called a lymphocyte recognises the antigen as being foreign and produces antibodies that are specific to that antigen.
Drop in functioning, Unusual Behavior, and Mood changes. Just to name 3.
