Final answer:
A tick feeding on a human represents parasitism, where the tick benefits and the human is harmed.
Step-by-step explanation:
A tick feeding on a human is an example of parasitism. Parasitism is a symbiotic relationship in which one organism, the parasite, benefits while causing harm to the other organism, known as the host. In this case, the tick is the parasite that benefits by consuming the human's blood, and the human is the host that is harmed through potential blood loss and transmission of diseases such as Lyme disease.