Evolution - Wikipedia
网页Evolution by natural selection is established by observable facts about living organisms: (1) more offspring are often produced than can possibly survive; (2) traits vary among individuals with respect to their morphology, physiology, and behaviour; (3) different traits confer different rates of survival and reproduction (differential fitness ...
Natural Selection - Understanding Evolution
网页Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin’s grand idea of evolution by natural selection is relatively simple but often misunderstood. To see how it works, imagine a population of beetles: There is variation in traits.
Theory of Evolution - Education
网页2023年10月19日 · Natural selection was such a powerful idea in explaining the evolution of life that it became established as a scientific theory. Biologists have since observed numerous examples of natural selection influencing evolution. Today, it is known to be just one of several mechanisms by which life evolves.
Evolution - Natural Selection, Adaptation, Genetics | Britannica
网页2024年9月10日 · Those advantageous variations are preserved and multiplied from generation to generation at the expense of less-advantageous ones. This is the process known as natural selection. The outcome of the process is an organism that is well adapted to its environment, and evolution often occurs as a consequence.
Natural Selection - National Geographic Society
网页2023年10月19日 · Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species. It is one of the processes that drives evolution and helps to explain the diversity of life on Earth. Darwin chose the name natural selection to contrast with “artificial selection,” or selective breeding that is controlled by ...
Understanding Natural Selection: Essential Concepts and …
网页2009年4月9日 · Natural selection is one of the central mechanisms of evolutionary change and is the process responsible for the evolution of adaptive features. Without a working knowledge of natural selection, it is impossible to understand how or why living things have come to exhibit their diversity and complexity.
Khan Academy
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Mechanisms: the processes of evolution - Understanding Evolution
网页Evolution is the process by which modern organisms have descended from ancient ancestors. Evolution is responsible for both the remarkable similarities we see across all life and the amazing diversity of that life — but exactly how does it work? Here, we’ll find out.
Evolution | Definition, History, Types, & Examples | Britannica
网页2024年9月10日 · What is the basic concept of evolution as a scientific theory? Who was Charles Darwin, and how did he contribute to the theory of evolution? What is natural selection, and how does it drive the process of evolution? How do fossils provide evidence for evolution? What are some examples of evolution that …
Evolution | Learn Science at Scitable - Nature
网页Evolution is a process that results in changes in the genetic content of a population over time. There are two general classes of evolutionary change: microevolution and macroevolution.
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