Biology / Bio 1731 · Atom · ~20 seconds
Gradual Speciation and Punctuated Equilibrium
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The gradual model holds lineages diverge in small, steady steps; punctuated equilibrium holds change occurs in rapid bursts, followed by long stasis.
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A fossil sequence with steady change across many strata fits the gradual model; sudden change then long unchanged stretches fits punctuated equilibrium.
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Punctuated equilibrium describes a faster tempo, not a different mechanism — selection still drives change under either model.