Punctuated equilibrium is a theory in evolutionary biology which states that most species will show little to no evolutionary change throughout their history. When evolution does occur, it happens sporadically and occurs relatively quickly compared to the species full duration on earth. For this reason, the theory is sometimes called evolution by jerks. Punctuated equilibrium is commonly contrasted against the theory of phyletic gradualism (“evolution by creeps”), which hypothesizes that most evolution occurs uniformly and by the steady and gradual transformation of whole lineages.
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