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引言随着西澳大利亚瓦拉沃纳群硅质岩中小球状和丝状微化石及选层石的发现,可以确信生命的历史可追溯到35亿年以前。真核生物的出现可能早于15亿年,但是直到大约13亿年以前尚未找到确切的标本。后生动物大约在6.8至5.7亿年期间出现,宣告进入了显生宙时代。在最早期的生命历史中伴随着由前生物有机化合物所洪给的、可能是异养的最早生物的发展导致生物演化上的转折点。自养生物[造甲基(Methanogens)和光合自养厌
INTRODUCTION With the discovery of small globular and filamentous microfossils and feldspar stratigraphy in the Walawona Group from Western Australia, it is believed that the history of life goes back 3.5 billion years. The appearance of eukaryotes may be as early as 1.5 billion years, but until about 1.3 billion years ago have not yet found the exact specimen. The metazoan appeared about 6.8 to 5.7 billion years ago, declared into the Phanerozoic era. The earliest biological history, accompanied by the development of the earliest possible heterotrophic organisms, flooded by ex-bioorganic compounds, led to a turning point in biological evolution. Autotrophs [Methanogens and photosynthetic autotrophs