Abstract
Several aspects of early evolution of life has been studied in several different research fields including planetary science, earth physics, geology, chemical evolution, environmental microbiology and molecular evolution. In this review I have summarized the recent results of geology, environmental microbiology on deep-sea hydrothermal area, and our recent studies on the common ancestor of all the living organisms on the earth (Commonote). The possible scenario on the origin and early evolution of life is also discussed.
