Abiogenesis - Wikipedia
Life functions through the specialized chemistry of carbon and water, and builds largely upon four key families of chemicals: lipids for cell membranes, carbohydrates such as sugars, amino acids for protein metabolism, and nucleic acid DNA and RNA for the mechanisms of heredity.
The origin of life on Earth, explained - University of Chicago News
2022年9月19日 · The origin of life on Earth stands as one of the great mysteries of science. To find out if we are alone in the galaxy, we will need to better understand what geochemical conditions nurtured the first life forms.
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.
Life - Origin, Evolution, Abiogenesis | Britannica
2024年9月3日 · Life - Origin, Evolution, Abiogenesis: Perhaps the most fundamental and at the same time the least understood biological problem is the origin of life. It is central to many scientific and philosophical problems and to any consideration of extraterrestrial life.
The Origin of Life on Earth - Scientific American
2009年9月1日 · The earliest forms of life could have been simple membranes made of fatty acids—also structures known to form spontaneously—that enveloped water and these self-replicating genetic molecules.
Evolution and the history of life on Earth - Encyclopedia Britannica
2024年9月3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.
How did life originate? - Understanding Evolution
All living things reproduce, copying their genetic material and passing it on to their offspring. Thus, the ability to copy the molecules that encode genetic information is a key step in the origin of life — without it, life could not exist.
How Did Life Begin? - Nature
2018年5月9日 · The discovery of thousands of exoplanets has sparked a renaissance in origin-of-life studies. In a stunning surprise, almost all the newly discovered solar systems look very different from...
Abiogenesis | Definition & Theory | Britannica
2024年9月24日 · abiogenesis, the idea that life arose from nonlife more than 3.5 billion years ago on Earth. Abiogenesis proposes that the first life-forms generated were very simple and through a gradual process became increasingly complex.
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.