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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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Q: What theory that evolution occurs slowly but steadily?
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What theory proposes that evolution occurs steadily in tiny changes over long periods of time?

Darwin's theory is correct but the smaller parts within that answer is called Gradualism which is more commonly used


What is gradualism?

Gradualism is the policy of gradual reform rather than sudden change or revolution; in biology, the theory that evolution occurs slowly but steadily rather than abruptly.


The theory that evolution occurs slowly but steadily is called?

Darwin's classic theory of evolution assumed that evolution is a slow, contunuous process, by which new species evolve and emerge. This is referred to at times as "organic evolution" and the "synthetic theory of evolution", or just the Darwinian theory of evolution. A newer theory, proposed originally by Niles Eldridge and Stephen Jay Gould is known as "punctuated equilibria", a model in which the evloution of new species occurs only periodically, in relatively rapid spurts. See "Time Frames the Rethinking of Darwinian Evolution and the Theory of Punctuated Equilibraia, Simon & Schuster, 1985"AnswerThe slow, constant process has also been called "gradualism."


Theory that evolutionary change occurs slowly?

Gradualism.


What theory purposes that evolution occurs steadily in tiny changes over long periods of time?

That's part of the theory of evolution by natural selection (Darwinism) but not the main principle, and some other (obsolete) theories also included this belief. I don't know if there is a more specific answer, but if you can't find one, just go with natural selection.


What modern synthesis theory states that evolution occurs through changes in the gene pool of?

population


What is the theory that evolution occurs during short period of rapid change?

Equilibria


What is the hypothesis that evolution occurred slowly but steadily called?

I think the attribution you are looking for is "Darwins' theory of evolution". He wrote several books hypothesizing his theories, the most pertinent to your question being "Origin of Species". You might also want to look up something called the "kalisto effect"... It is a theory based on a similar principal, but in which, occasionally evolution takes makes a giant step and creates a short lived, but particularly efficient abhoritional species


How does the punctuated equilibrium model of evolution states that evolution occurs rapidly?

Gradualism is the theory that evolution occurs slowly and consistently along periods of time. On the other hand, punctuated equilibrium is the theory that evolution does not occurs for long periods of time and then suddenly evolves rapidly in a small short period of time.


What theory has been used to explain the pattern of rapid evolution that often occurs after a mass extinction event?

The theory of rapid evolution rather than over a very long time.


The theory that evolution occurs during short periods of rapid change is puntuated?

Punctuated equilibrium.


What is the name of the hypothesis that evolution occurs at an irregular rate through geologic time?

That theory is called punctuated equilibrium.