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Define antigen and antibody with a suita...

Define antigen and antibody with a suitable example of each.

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### Step-by-Step Solution: **Step 1: Define Antigen** An antigen is a substance that can provoke an immune response in the body. It can be either a living organism (like bacteria or viruses) or a non-living substance (like pollen or certain chemicals). When an antigen enters the body, it is recognized by the immune system, which then activates various immune responses to eliminate it. **Example of Antigen:** A common example of an antigen is the bacterium *Salmonella*, which can cause typhoid fever when it enters the human body. The presence of *Salmonella* triggers the immune system to respond and fight off the infection. ...
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