Man is a creation of evolution. Therefore, human evolution is closely related to the origin of life and its development on the earth. It is normal to speak of evolution ‘from amoeba to Man’, as if the amoeba is the simplest form of life. But, there are several organisms more primitives than amoeba, say for example viruses. The evolution from a self-replicating organic molecule to a protozoan, like amoeba, is the most complex step in evolution, which might have consumed the same extent of time from