According to the punctuated equilibria model,

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The punctuated equilibria model suggests that most new species accumulate their unique features relatively rapidly as they come into existence, followed by periods of little change for the rest of their duration as a species. This is in contrast to the gradualism model, which suggests that evolution occurs gradually and continuously over long periods of time. The punctuated equilibria model still relies on natural selection as a mechanism of evolution, but suggests that it operates in a more sporadic and punctuated manner.

According to the Punctuated Equilibria Model