Excessive populations in an area to the point of overcrowding, depletion of natural resources, or environmental breakdown.

The changes that animals make to enable them to be better suited to live successfully in their ecosystem.

The behaviors and physical characteristics of species that allow them to live successfully in their ecosystem.

An organism's role, or how it makes its living in the ecosystem.

The struggle between organisms to survive in their habitat with limited resources.

An interaction in which one organism kills and eats another.

The organism that does the killing in predation

The organism that is killed in predation.

A symbiotic relationship in which both species benefit in the relationship.

A symbiotic relationship in which one species benefits and the other is neither helped or hurt by the relationship.

A symbiotic relationship in which one organism lives on or inside another organism and harms that organism.

The organism that benefits in parasitism, the organism that lives on or inside another organism. (Flea, Tick, Heartworm)

The organism that the parasite lives on or inside and is hurt in the relationship called parasitism.

A gradual and natural change in an ecosystem over a long period of time.

A series of changes that take place where no ecosystem has ever existed before. This happens where there is no existing soil (bare rock).

The first species to populate a new ecosystem in primary succession, usually these are lichens or some type of moss.

A series of changes that take place after a disturbance has happened in an ecosystem (forest fire, hurricane, tornado, drought, farming, logging, mining) There is existing soil already in place.

Scientists who study how all the biotic and abiotic factors in an ecosystem are related. These scientists study how organisms react to changes in their environment.

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