This formed the foundation of the neo-Darwinian evolutionary theory.
The evolution of a species is linked to the environment.
Biologists included principles from genetics in evolutionary theory during the 1920s and 1930s.
Between the mid-1930s and mid 1940s geneticists, systematists and palaeontologists collaborated to create a united approach to evolution, the "Modern Synthesis".
erectus (including the Java and Peking hominids - the archetypal Missing Link) and H.
sapiens (including Neanderthals and Cro-Magnon) (see the modern taxonomic classification of humans).