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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. Dates in this article are consensus estimates based on scientific evidence, mainly fossils.
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. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species ...
Structures of communities of microorganisms, layered rocks called stromatolites, are found from more than three billion years ago. 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.
Jul 14, 2009 · 14 July 2009 , updated 27 April 2023. Galapagos tortoises are the product of over 3 billion years of evolution. Andy Rouse / Getty. There are all sorts of ways to reconstruct the history...
Mar 8, 2024 · March 08, 2024. Earth formed roughly 4.6 billion years ago, and for several hundred million years the planet’s surface was almost certainly too hot and heavily bombarded by comets and asteroids...
Oct 30, 2023 · MARK GARLICK/Spl/Alamy; HOW did life on Earth begin? Until 70 years ago, generations of scientists had failed to throw much light on biology’s murky beginnings. But then came three crucial...
Jun 13, 2023 · 10 min read. Beginnings: Life on Our World and Others. Pat Brennan. Jun 13, 2023. Article. Earth’s surface is shown as it might have looked some 3.8 billion years ago, perhaps when life was just beginning, in this artist’s rendering. Illustration: NASA/JPL-Caltech/Lizbeth B. De La Torre. Where do we begin?
