A worm in your intestine is an example of a parasite. Thus the correct answer is option (A).
The transmission of parasitic illnesses can happen in a variety of ways. Some diseases can spread through sexual contact. Certain parasites can be spread by insects that serve as a disease's vector or carrier.
Both the host and the parasite are housed within the same body as the parasite. A creature that lives on or inside another living organism and depends on it for nutrition is referred to as a "parasite." The relationship is referred to as parasitic when one creature, the parasite, feeds on another, the host, harming or even killing the host.
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