Gradualism is the concept but I would not give it the ranking of scientific theory. It is more a subset of the theory of evolution by natural selection and was first formulated into that theory by Darwin.
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The theory you are referring to is often known as gradualism. It posits that evolution proceeds at a constant and slow rate over long periods of time, leading to gradual changes in species. This contrasts with the theory of punctuated equilibrium, which suggests that evolution can occur rapidly in short bursts followed by long periods of stasis.
The hypothesis that evolution occurred slowly but steadily is called gradualism. This theory suggests that small, incremental changes accumulated over long periods of time to result in the diversity of life we see today.
The theory that proposes evolution occurs steadily in tiny changes over long periods of time is gradualism. This idea suggests that species evolve slowly and continuously through small, incremental changes rather than through sudden, dramatic shifts.
The theory of punctuated equilibrium suggests that evolution occurs rapidly in short bursts followed by long periods of stability. This contrasts with gradualism, which proposes that evolution happens slowly and steadily over time. Punctuated equilibrium is supported by the fossil record, where evidence of rapid changes in species can be observed.
When evolution occurs at a slow steady pace, the rate is defined as gradualism. This theory suggests that species evolve slowly over time through accumulating small changes.
Gradualism is the theory that evolutionary change occurs slowly and steadily over time through small, incremental changes in populations. It suggests that large evolutionary transitions are the result of many small changes accumulating over long periods of time. This contrasts with the idea of punctuated equilibrium, which proposes that evolution happens rapidly in short bursts followed by long periods of stasis.