New species appear relatively quickly are associated with the theory of . (a) punctuated equilibrium. So option (a) is the correct answer.
A pattern of rapid evolutionary change followed by long periods of stagnation is a pattern explained by an interrupted equilibrium. Punctuation equilibrium states show that organisms do not change much as they appear in the fossil record.
Interrupted equilibrium predicts that many species evolutionary changes occur on short time scales associated with speciation events.
An intermittent equilibrium occurs as genetic variation passes more rapidly, increasing the rate of evolution and speciation. Tyrannosaurus fossils and mollusks species from the Turkana Basin are examples of intermittent equilibrium.
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