natural selection. n. The process in nature by which, according to Darwin's theory of evolution, only the organisms best adapted to their environment tend to survive and transmit their genetic characters in increasing numbers to succeeding generations while those less adapted tend to be eliminated. Natural selection definition is - a natural process that results in the survival and reproductive success of individuals or groups best adjusted to their environment . Darwin, Charles: On the Origin of SpeciesTitle page of Charles Darwin's On the Origin of Species by Means of Natural Selection, 1859. Library of Congress . Top definition . Get a Natural-Selection mug for your bunkmate Yasemin. 2 . Natural Selection doesn't apply to humans as long as humans stay indoors. Process by which evolutionary changes occur in living organisms over millions of years. According to Darwin's theory of evolution, the organisms well adapted to their environment survive better than those who are not and are able to pass on their genes to many more offspring. Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin's grand idea of evolution by natural selection is relatively simple but often misunderstood. To find out how it works, imagine a population of beetles: There is variation in traits. Natural selection is the differential survival and reproduction of individuals due to differences in . this distinction is important, scientists define '(phenotypic) natural selection' specifically as 'those mechanisms that contribute to the selection . Natural selection definition: Natural selection is a process by which species of animals and plants that are best. Meaning, pronunciation, translations and . Natural selection is the process that causes groups of organisms to change, or evolve, over time. Considering that animals must inherit their genetics from their . The mechanism that Darwin proposed for evolution is natural selection. Because resources are limited in nature, organisms with heritable traits that favor .