Evolution

Evolution
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1][2][3] This process occurs when evolutionary mechanisms—including natural selection, genetic drift, mutation and gene flow —act upon genetic variation within populations, causing certain heritable traits to become more or less prevalent across successive generations. [4 ...
Feb 6, 2026
The definition Biological evolution, simply put, is descent with inherited modification. This definition encompasses everything from small-scale evolution (for example, changes in the frequency of different gene versions in a population from one generation to the next) to large-scale evolution (for example, the descent of different species from a shared ancestor over many generations ...
Learn the definition, evidence, and mechanisms of biological evolution, and how it differs from individual changes and common misconceptions. Explore the role of natural selection, homologous and analogous structures, and the common biochemistry of life on Earth.
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Learn all about the history of life with these resources and articles on natural selection, genetics, cell types, Charles Darwin, and more.
The evidence for evolution is compelling and extensive. Looking at every level of organization in living systems, biologists see the signature of past and present evolution. Darwin dedicated a large portion of his book, On the Origin of Species, identifying patterns in nature that were consistent with evolution and since Darwin our understanding has become clearer and broader.
Evolution is the way living organisms change over time, driven by natural selection . A revolutionary insight put forward by Charles Darwin in On the Origin of Species in 1859, the concept of ...
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Explore real-world examples of natural selection in action and understand its role as a fundamental mechanism of evolution.
The complex eukaryotic cell ushered in a whole new era for life on Earth, because these cells evolved into multicellular organisms. But how did the eukaryotic cell itself evolve? How did a humble bacterium make this evolutionary leap from a simple prokaryotic cell to a more complex eukaryotic cell? The answer seems to be symbiosis — in other words, teamwork.
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Understanding Evolution
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The webpage provides an understanding of evolution and the history of life, focusing on using the tree for classification.
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High-stakes rock-paper-scissors: These lizards are all in on an evolutionary game Posted January 31, 2026 You might think of rock-paper-scissors as a kids' game, good for choosing who gets to ride shotgun or who gets the last slice of pizza. But for the side-blotched lizards of western North America, it's not just a game. It's a way of life. Literally. Male lizards seek their mates using ...
Understanding Evolution offers comprehensive insights into the principles, mechanisms, and history of evolution to enhance knowledge of life's diversity.
Jan 28, 2025
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Evolution in its contemporary meaning in biology typically refers to the changes in the proportions of biological types in a population over time (see the entries on evolutionary thought before Darwin and Darwin: from Origin of Species to Descent of Man for earlier meanings). As evolution is too large of a topic to address thoroughly in one entry, the primary goal of this entry is to serve as ...
In biology, evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs. Biological populations evolve through genetic changes that correspond to changes in the organisms ' observable traits. Genetic changes include mutations, which are caused by damage or replication errors in organisms' DNA. As the genetic variation ...
Feb 6, 2026
Evolution: Directed by Ivan Reitman. With David Duchovny, Orlando Jones, Julianne Moore, Seann William Scott. Two college professors team up with a fire-fighting cadet and a government scientist to combat an alien organism that has been rapidly evolving since its arrival on Earth inside a meteor.
Jul 22, 2024
Evolution, the official journal of the Society for the Study of Evolutionà  à  à  à ¢à  à  à  à  à  à  à  à ¢, publishes articles in all areas of evolutionary biology focused on broadening understanding of evolutionary phenomena and processes at all levels of biological organization.
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.
The central ideas of evolution are that life has a history — it has changed over time — and that different species share common ancestors. Here, you can explore how evolutionary change and evolutionary relationships are represented in "family trees," how these trees are constructed, and how this knowledge affects biological classification. You will also find a timeline of evolutionary ...
Dec 11, 2025
Misconceptions about evolutionary theory and processes MISCONCEPTION: Evolution is a theory about the origin of life. CORRECTION: Evolutionary theory does encompass ideas and evidence regarding life's origins (e.g., whether or not it happened near a deep-sea vent, which organic molecules came first, etc.), but this is not the central focus of evolutionary theory. Most of evolutionary biology ...
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection.
Review your understanding of evolution in this free article aligned to NGSS standards.
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