Homo erectus

*Includes pictures *Includes online resources and a bibliography for further reading Most scientists believe the evolution of humans has a history as long as life itself. Anatomically modern humans and all other life that has existed on the planet first came about from the single-celled microorganisms that emerged approximately 4 billion years ago. Through the processes of mutation and natural selection, all forms of life developed, and this continuous lineage of life makes it difficult to say precisely when one species completely separates from another. In other words, scientists still debate when a human became a human rather than the ancestor species that came before. Around 1.8 million years ago, a third species of Homo appeared in the fossil record. H. erectus would have shared the landscape for a time with H. habilis and H. rudolfensis, but the fossils of H. erectus are not limited to eastern and southern Africa. Instead, they are found across Africa and parts of mainland and