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Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor.
19 de set. de 2022 · Learn about the mysteries and challenges of understanding how life emerged on Earth 4.3 billion years ago. Explore the possible scenarios, evidence and experiments conducted by UChicago scientists and others.
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 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.
14 de jul. de 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...
8 de mar. de 2024 · Learn about the possible origins of life on Earth, from lightning strikes to outer space to deep sea vents. Scientists explore the evidence and challenges of each theory, and the role of water and sunlight in the chemical reactions.
19 de out. de 2015 · When did life on Earth begin? Scientists have dug down through the geologic record, and the deeper they look, the more it seems that biology appeared early in our planet's 4.5-billion-year history. So far, geologists have uncovered possible traces of life as far back as 3.8 billion years.
