Natural selection is the evolutionary theory that states that the populations of evolving species adapt to the changing environment and is based on the phenomenon of the survival of the fittest.
Competition is caused due to the demand by entities for limited environmental resources.
Adaptation is the result of inherited traits that increases the chance of survival.
Variation is the occurrence of an entity in more than one different form or color.
Overproduction occurs due to the production of more entities than which can live.
Speciation is the known as the formation of new species due to physiological, geographic, anatomical, or behavioral factors