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'When an organism is the first to inhabit an area or exploit a particular resource, it competitively excludes others from doing the same'.

Gause's law of competitive exclusion states that....

An introduced species becomes an invasive species when....

In order to prove his theory of competitive exclusion, Gause performed experiments on ....

'An organism can expand it's niche in response to removal of a competitor, or through invasion into new areas'.