Answer:
The immune system recognizes damaged cells, irritants, and pathogens, and it begins the healing process. When something harmful or irritating affects a part of our body, there is a biological response to try to remove it.
...
These can include:
fatigue.
mouth sores.
chest pain.
abdominal pain.
fever.
rash.
joint pain.
Because you always have to learn
Red blood cells or erythrocytes
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Answer:
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Explanation:
