Final answer:
A parasite is an organism that lives off another living being, benefiting itself at the expense of the host. Parasitic relationships involve the parasite deriving nutrients from the host, weakening it in the process.
Explanation:
A parasite is an organism that lives in or on another living organism and derives nutrients from it. In a parasitic relationship, the parasite benefits, but the organism being fed upon, the host, is harmed. The reproductive cycles of parasites can be complex, sometimes requiring multiple hosts.
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