How does competition increase stability in an ecosystem?

Competition increases the complexity of the ecosystem and thus stabilizes it

Explanation:

Due to increase in competition with in an ecosystem, there arise several types of distinct organisms which lead to the formation of several micro food chains with in a food web.  

These large number of food chains creates complexity with in an ecosystem and due to this an ecosystem becomes stable. By stable ecosystem we mean, whenever there is a small/large disturbance caused by some external agents, the ecosystem is able to bounce back to its original position as by then ecosystem has adapted itself to grasp changes caused by biotic and abiotic factors.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.