Discussion
The relationship between two organisms in which one receives benefit at the cost of other is known as
Answer: B
The relationship in which one organism gains at the cost of the other is parasitism, option (B). The parasite lives on or in the host and feeds on it, and the host is harmed though usually not killed at once. In predation (A) the predator kills and eats the prey, and scavenging (C) is the feeding on dead remains. Symbiosis (D) is a close association in which both partners usually benefit, so it is not a relation in which one loses.
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