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.

martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.

independent innovation during the abbasid caliphate