Populations and Communities

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A close relationship between two species that benefits at least one of the species.

An organism that is killed and eaten by another organism.

The organism that benefits by living on or in a host in a parasitism interaction.

A relationship in which one organism lives on or in a host and harms it.

The organism that does the killing in a predation interaction.

The organism that a parasite lives in or on in a parasitism interaction.

A relationship between two species in which one species benefits and the other is neither helped nor harmed.

The struggle between organisms to survive as they attempts to use the same limited resource.