Parasite
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Example:
Imagine you're at a dinner party, and there's that one guest who never brings anything but always eats the most and leaves a mess. This situation is much like how parasites, such as lice or ticks, operate by living off a host, taking nutrients, and causing harm in the process. Just as the inconsiderate dinner guest drains resources and creates problems for the host, parasites drain nutrients and energy from their host organism, often causing disease or discomfort.

Practice Version

Parasite: An organism that lives in or on another organism, harming it in the process, like lice or ticks. Parasite. In simple terms, a parasite is a creature that depends on another living being for survival while causing it harm.