A small marine amphipod has recently been discovered that carries another bad tasting organism on its back against its normal behavior.The "backpack" organism tastes bad.If a fish ingests the pair,it immediately spits them back out.If the amphipod is alone,however,the amphipod is readily eaten and swallowed.There is no apparent benefit in this relationship for the "backpack" organism which appears to be neither helped nor harmed.This is therefore a case of

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A mutualistic relationship both organisms benefit from a mutual exploitation of the other.In a parasitic relationship one organism benefits and the other is harmed by the interaction and the parasite lives either in or on the host.In commensalism organisms interact so that one organism benefits from the interaction while the interaction is neutral for the other organism.Competitive exclusion happens when one species directly competes with another for a particular resource,if both species exist in the same habitat the less efficient species will be excluded from the resource.Predation is a type of species interaction where one organism is harmed and the other is benefited because one organism feed on the other.

A Small Marine Amphipod Has Recently Been Discovered That Carries