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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.
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.
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 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.
The first signs of microbial life emerged around 3.5 billion years ago. Scientists think early life may have formed from lighting strikes or arisen in deep sea vents.
Life - Evolution, History, Earth: The evidence is overwhelming that all life on Earth has evolved from common ancestors in an unbroken chain since its origin. Darwin’s principle of evolution is summarized by the following facts.
Learn what fossil evidence reveals about the origins of the first life on Earth, from bacteria to animals, including the phyla we know today.
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 animals
But a true understanding of life, on Earth or some other world, likely will require us to unravel even earlier beginnings: the ignition of stars with their freight of life’s building blocks, the formation of planets from protoplanetary disks, the energy and chemistry of surfaces and atmospheres.
The earliest evidence for life on Earth arises among the oldest rocks still preserved on the planet, dating back some 4 billion years.