Environmental Science

Natural Selection
A process by which characteristics that make an individual better suited to its environment become more common in a species.
Adaptation
A behavior or physical characteristic that allows an organism to live successfully in its environment.
Niche
The role of an organism in its habitat, or how it makes its living.
Competition
The struggle between organisms to survive as they attempt to use the same limited resource.
Predation
An interaction in which one organism kills another for food.
Predator
The organism that does the killing in a predation interaction.
Prey
An organism that is killed and eaten by another organism.
Symbiosis
A close relationship between two species that benefits at least one of the species.
Mutualism
A relationship between two species in which both species benefit.
Commensalism
A relationship between two species in which one species benefits and the other is neither helped nor harmed.
Parasite
The organism that benefits by livng on or in a host in a parasitism interaction.
Parasitism
A relationship in which one organism lives on or in a host and harms it.
Host
The organism that a parasite lives in or on in a parasitism interaction.
Succession
The series of predictable changes that occur in a community over time.
Primary Succession
The series of changes that occur in an area where no soil or organisms exist.
Pioneer Species
The first species to populate an area.
Secondary Succession
The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist.

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