Organic evolution is change in the characteristics of a population or species of organisms over the course of generation. The evolutionary changes are always inheritable. The changes in an individual are not considered as evolution, because evolution leads to population and not to individuals. Correct Answer Organic evolution is change in the characteristics of a population or species of organisms over the course of generation. The evolutionary changes are always inheritable. The changes in an individual are not considered as evolution, because evolution leads to population and not to individuals.