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The history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to present day.
This article is about the evolution of all life on Earth. For more detailed and comprehensive coverage, see History of life. The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth.
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Sep 19, 2022 · The origin of life on Earth stands as one of the great mysteries of science. Various answers have been proposed, all of which remain unverified. To find out if we are alone in the galaxy, we will need to better understand what geochemical conditions nurtured the first life forms.
Since Earth is about 4.6 billion years old, these finds suggest that the origin of life must have occurred within a few hundred million years of that time. Chemical analyses on organic matter extracted from the oldest sediments show what sorts of organic molecules are preserved in the rock record.
Jul 14, 2009 · Timeline: The evolution of life. The story of evolution spans over 3 billion years and shows how microscopic single-celled organisms transformed Earth and gave rise to complex organisms like ...
Origins of life. Hypotheses about the origins of life. The RNA origin of life. RNA world. The diversification of life. Life began on Earth at least 3.5 billion years ago. Since then, it's diversified in an amazing way! Learn about important events in the history of living organism on Earth, up to and including the appearance of humans.
Life on Earth has existed for at least 3.5 billion years, [66] [67] [68] [69] with the oldest physical traces of life dating back 3.7 billion years. [70] [71] Estimates from molecular clocks, as summarized in the TimeTree public database, place the origin of life around 4.0 billion years ago. [72]
