Final answer:
Antigens are foreign molecules triggering immune responses, while antibodies target specific antigens for destruction by the immune system.
Explanation:
Antigens are protein molecules that the immune system recognizes as nonself. They can trigger an immune response because they are foreign to the body. Not all antigens provoke a response, as individuals produce 'self' antigens and are exposed to harmless foreign antigens.
Antibodies are molecules that match and bind to specific antigens, targeting them for destruction. They are produced by the immune system in response to non-self antigens. Chemical messengers, proteins binding to pathogens, and the immune response are all related to antigens and antibody responses in the immune system.
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