Anything that controls survival of a population

Relationship that benefits one organism with no harm to the other organism

A species that is in danger of becoming extinct

Two organisms that have a relationship that helps one or both of them

Maximum population size that that the resources in an area can support

The overlapping food chains in an ecosystems

Relationship that benefits both organisms

A species that is in danger of becoming endangered

Relationship where one organism lives on or in a host and causes it harm.

A species that has died out completely

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