- Protection from many hazards in the environment.

- Diseases cannot be immunized, such as cancer or AIDS

- Immune system protects against foreign substances, and problems that may arise during that process

- Cells of the immune system function to protect the individual organism against threats from anything that is foreign, or nonself.

- Predominant threat to humans is infectious

- invasion of the body by foreign organisms, viruses, bacteria, and fungi

- Disease results when cells tissues have been damaged so much that they can no longer function properly

- Without an immune system humans would

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