Organisms called parasites are

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Parasites are organisms that live in or on another organism (the host) and harm it. They derive nutrition from the host and often cause damage or disease. While there are some cases where parasites may benefit the host or have a symbiotic relationship, most are harmful. Parasites can come from many different groups and are not always classified in the kingdom Monera. They are also not always viruses, and some parasites are free-living at certain stages of their life cycle, but they still have a parasitic relationship with a host at some point.

Organisms Called Parasites Are