___ is a plant or animal that lives on or within another living organism at the expense of that organism.

A. complement system
B. macrophage
C. parasite



Answer :

Final answer:

A parasite is an organism that benefits from living on or within another organism while harming it by siphoning its resources.


Explanation:

Parasite is a plant or animal that lives on or within another living organism at the expense of that organism. In a parasitic relationship, the parasite benefits while the host is harmed, usually weakened by the parasite as it siphons resources the host needs to survive.


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