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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.
For a chronological guide, see Timeline of the evolutionary history of life. The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day.
The timeline of life on earth begins over 4.5 billion years ago. In the beginning, survival was difficult for any life forms. The struggle started and soon after earth’s formation, organisms start appearing. It makes sense the first signs of life on planet earth are incredibly simple. The earliest fossil evidence of life on earth dates to 3.7 ...
14 lip 2009 · However, the idea that there is an especially intense “ Late Heavy Bombardment ” between about 4 and 3.8 billion years ago, which obliterates any life, no longer seems to be true....
19 wrz 2022 · 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.
25 paź 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.
Therefore, the earliest time for the origin of life on Earth is at most 3.5 billion years ago, possibly as early as 4.1 billion years ago — not long after the oceans formed 4.5 billion years ago and after the formation of the Earth 4.54 billion years ago.
