History of life - Wikipedia
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.
Timeline of the evolutionary history of life - Wikipedia
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.
Evolution and the history of life on Earth - Encyclopedia Britannica
2024年10月25日 · 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.
The origin of life on Earth, explained - University of Chicago News
2022年9月19日 · 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.
History of Life on Earth - Smithsonian National Museum of Natural History
2024年10月31日 · Learn what fossil evidence reveals about the origins of the first life on Earth, from bacteria to animals, including the phyla we know today.
Timeline of the evolution of life on Earth - New Scientist
2009年7月14日 · Life 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...
Beginnings: Life on Our World and Others - NASA Science
2023年6月13日 · 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, …
Life | Definition, Origin, Evolution, Diversity, & Facts | Britannica
2024年10月25日 · Life-forms present on Earth today have evolved from ancient common ancestors through the generation of hereditary variation and natural selection. Although some studies state that life may have begun as early as 4.1 billion years ago, it can be traced to fossils dated to 3.5–3.7 billion years ago, which is still only slightly younger than ...
Life - Evolution, Diversity, Biology | Britannica
2024年10月25日 · timeline of life on Earth Over hundreds of millions of years, life spread through the seas and over Earth's surface. The first life-forms were small and simple. Later forms were more complicated and diverse. (more)
NOVA | Origins | A Brief History of Life - PBS
In this illustrated interactive timeline, explore a brief history of life on Earth, from the earliest bacteria in the Precambrian Period, to the first modern humans.