The gradual cumulative, adaptive and heritable changes in an organism over a long period of time resulting in new species is called

The gradual cumulative, adaptive and heritable changes in an organism over a long period of time resulting in new species is called organic evolution. Organic evolution is the process by which species of living organisms change over time through a combination of genetic variation and natural selection. Over many generations, small changes in the traits of an organism accumulate, leading to new, distinct species that are better adapted to their environment. This process can take hundreds or thousands of years and is driven by the survival and reproduction of organisms that have traits that give them an advantage in their environment.