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Populations and Communities

Horizontales
All living and nonliving things in an area
Smallest level of ecological organization
Organisms moving into an area
Series of changes that occur to an already existing ecosystem
An organism leaving an area
All living factors
First species to colonize an area (Ex. is lichens)
Verticales
All members of a species in a certain area
Both organisms benefit during this relationship
Series of changes that occur to an area with no existing ecosystem
One species benefits and the other is negatively impacted
One species benefits while the other is unaffected
All non-living factors
An organisms specific role