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As per Biology, any association of 2 organisms where, one of the organisms obtains or exploits something it needs to thrive from the other( called host) but provides no benefit in return rather may be detrimental to its host's survival is a parasite.

examples:

Tapeworm found in animal intestine.

common example Louse, which is a blood sucking parasite which may aid transmitting microbial diseases.

A human being exploiting the Natural Resources of earth may also be termed as demonstrating parasitic behaviour towards the planet.

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