- Evolution | Definition, History, Types, Examples | 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 differences are due to modifications in successive generations The theory of evolution is one of the fundamental keystones of modern biological theory The diversity of the living world is staggering
- An introduction to evolution - Understanding Evolution
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)
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