Parasitic relation is the ecological relationship that includes parasites living off the host. In this one species gets benefitted while the other gets harmed.
Parasitism is a type of ecological relationship in which a parasite lives off the host body internally or externally to get benefitted. The host is in harm but the parasite gets benefitted.
The host provides benefits like protection, shelter, food to the parasite living off its body at its own expense. The host can get harmed by the parasite by getting a disease.
Therefore, one organism gets benefitted while the other is harmed.
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