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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.
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 indicate that they have diverged through the process of evolution from a common ancestor.
Sep 19, 2022 · When did life on Earth begin? Earth is about 4.5 billion years old. Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. The oldest known fossils, however, are only 3.7 billion years old.
Oct 25, 2024 · 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 · 4.29 billion years ago. Chemical traces in rocks from Canada may represent evidence of life from a deep-sea vent, but the results are contested. When and how life begins remains highly...
Aug 16, 2024 · The earliest fossil evidence we have for life is around 3.4 billion years old. Some studies push back Luca's age close to the birth of Earth, 4.5 billion years ago. Others think this is impossible because of the time it would take to establish the genetic code and DNA replication machinery.
Over time, the Earth cooled, causing the formation of a solid crust, and allowing liquid water on the surface. The Hadean eon represents the time before a reliable (fossil) record of life; it began with the formation of the planet and ended 4.0 billion years ago.
