Answer:
I think it may be vaccine because it's man made
Answer: vaccine
Explanation:
White blood cells are part of the body's immune system. They help the body fight infection and other diseases. Types of white blood cells are granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells).
B
Tobacco contains nicotine which is increases the user's risk of oral cancer
