Evolution | Definition, History, Types, & Examples | Britannica
Dec 31, 2025 · This article discusses evolution as it applies generally to living things. For a discussion of human evolution, see the article human evolution. For a more complete …
Evolution - Natural, Sexual, Artificial | Britannica
Dec 31, 2025 · Evolution - Natural, Sexual, Artificial: Natural selection can be studied by analyzing its effects on changing gene frequencies, but it can also be explored by examining its effects …
Biology - Evolution, Genetics, Species | Britannica
Dec 5, 2025 · Evidence to support the theory of evolution has come primarily from the fossil record, from comparative studies of structure and function, from studies of embryological …
Human evolution | History, Stages, Timeline, Tree, Chart, & Facts ...
Dec 26, 2025 · See the article evolution for a full explanation of evolutionary theory, including its main proponents both before and after Darwin, its arousal of both resistance and acceptance …
Selection | Evolution, Adaptation & Genetics | Britannica
evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the distinguishable …
Homology | Morphology, Comparative Anatomy & Genetics
Both originated in the forelimbs of early mammalian ancestors, but they have undergone different evolutionary modification to perform the radically different tasks of flying and swimming, …
Evolution - Species, Genetics, Trees | Britannica
Dec 31, 2025 · Evolution - Species, Genetics, Trees: Evolutionary trees are models that seek to reconstruct the evolutionary history of taxa—i.e., species or other groups of organisms, such …
Variation | Definition, Examples, & Facts | Britannica
evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the distinguishable …
Speciation | Causes, Process, & Types | Britannica
evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the distinguishable …
Calendar | Chronology, History, & Types | Britannica
Dec 16, 2025 · Seasons vary in different parts of the world. In tropical countries there are just the rainy and dry periods, but elsewhere there are successions of wider changes.