A chronospecies is a species which which changes physically, morphologically, genetically, and/or behaviorally over time on an evolutionary scale such that the originating species and the species it becomes could not be classified as the same species had they existed at the same point in time. Throughout the change of a chronospecies, there is only one species at any point in time, as opposed to an evolutionary species which branches off into many diverse species. In biology, a species is the basic unit of biodiversity. ... Comparative anatomy is the study of similarities and differences in organisms. ... Genetics (from the Greek genno γεννώ= give birth) is the science of genes, heredity, and the variation of organisms. ... Behavior (or behaviour in Commonwealth English) refers to the actions or reactions of an object or organism, usually in relation to the environment. ...

Examples of chronospecies are Homo erectus, Homo habilis, Homo heidelbergensis. Binomial name Homo erectus Dubois, 1894 Subspecies Homo erectus palaeojavanicus Homo erectus soloensis Homo erectus (upright man) is a hominin species that is believed to be an ancestor of modern humans (with Homo heidelbergensis usually treated as an intermediary step). ... Binomial name Homo habilis Leakey et al. ... Binomial name Homo heidelbergensis Schoetensack, 1908 Homo heidelbergensis (nicknamed Goliath) is an extinct species of the genus Homo and the common ancestor of both Neanderthal man (Homo neanderthalensis) and Cro-Magnon man (Homo sapiens). ...