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

Ans. (a).organisms attempt to fill the same niche.

Competitive exclusion can be defined as elimination of one or more different species from a habitat that share identical need for resources, such as food and shelter.  

It occurs due to competition between organisms of two species present in same habitat or niche for the same limiting resource (s). It results in either extinction of weaker competitive species or he will shift to a new habitat.

Thus, the correct answer is option (a).

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

d) center of the mid-ocean ridge

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