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Life - Wikipedia
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction. All life over time … 展开
Challenge
The definition of life has long been a challenge for scientists and philosophers. This is partially because life is a process, not a substance. This is complicated by a lack of knowledge of the … 展开The diversity of life on Earth is a result of the dynamic interplay between genetic opportunity, metabolic capability, environmental challenges, … 展开
Chemical elements
All life forms require certain core chemical elements for their biochemical functioning. These include carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur—the elemental macronutrients for all organisms. Together … 展开Materialism
Some of the earliest theories of life were materialist, holding that all that exists is matter, and that life is merely a complex form or arrangement of … 展开Origin of life
The age of Earth is about 4.54 billion years. Life on Earth has existed for at least 3.5 billion years, with the oldest physical traces of life dating back 3.7 billion years. Estimates from molecular clocks, as summarised in the 展开Antiquity
The first classification of organisms was made by the Greek philosopher Aristotle (384–322 BC), who grouped living things as either plants or animals, based mainly on their ability to move. He distinguished animals with blood from … 展开Though life is confirmed only on Earth, many think that extraterrestrial life is not only plausible, but probable or inevitable, possibly resulting in a 展开
CC-BY-SA 许可证中的维基百科文本 Life | Definition, Origin, Evolution, Diversity, & Facts | Britannica
Life - Simple English Wikipedia, the free encyclopedia
Learn about life, a concept in biology that separates living things from dead matter. Explore the properties, levels, and origins of life on Earth and beyond.
Meaning of life - Wikipedia
生命 - 维基百科,自由的百科全书
History of life - Wikipedia
Learn about the origins and evolution of life on Earth, from the earliest microbial mats to the present day. Explore the major events, processes and patterns of life's diversity and history, with references and links to related topics.
Origin of life - Simple English Wikipedia, the free encyclopedia
生命是什么 - 维基百科,自由的百科全书
Wikipedia
Wikipedia is a collaborative project that provides free access to information on various topics, from history and science to culture and arts. You can read Wikipedia in your language or choose from over 100 languages, including …
Life - Origin, Evolution, Abiogenesis | Britannica
6 天之前 · Life, particularly simple forms, spontaneously and readily arises from nonliving matter in short periods of time, today as in the past. Life is coeternal with matter and has no beginning; life arrived on Earth at the time of Earth’s …