Competitive exclusion occurs when
a. organisms attempt to fill the same niche
b. organisms mark their territory
c. organisms experience intraspecific aggression
d. organisms have a symbiotic relationship

I believe the answer is: a. organisms attempt to fill the same niche

Competitive exclusion refers to a principle that stated that two organisms who compete for the same resources cannot had the same constant population values together. This mean that when one of the organisms experiencing a rise in population, the other competing organism would experience a decline in population and vice versa.

sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532.

hello there the answer is a

sorry if i am wrong hope that : )