Answer:
The Immune system is a complex network of cells (such as lymphocytes) and organs that work together to defend the body against foreign substances (antigens) such as bacteria, a virus or tumor cell.
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Nitrogenous organic compounds that consist of large molecules
Hepatitis<span> A </span>virus<span> is usually spread from person to person by putting something in the mouth that has been contaminated with the stool of a person with </span>hepatitis<span> A. This type of transmission is called the "fecal-oral" route.</span>
Answer:
Hey Emanuel, Popeye's chicken sandwich was so popular when it first came out as you may know, but now it has been slow decreasing in popularity for some unknown reason over the world.
Hope that helps you a little and let me know if you want me to explain something else for you. :)