**Punctuated Equilibrium** is a theory in evolutionary [[Biology]] proposed by **Stephen Jay Gould** and **Niles Eldredge** in 1972. It suggests that species often experience long periods of **stasis** (little evolutionary [[Change]]), interrupted by brief periods of **rapid speciation** (sudden changes). ### Key Points: - **Not Gradual**: Contrasts with Darwin’s idea of slow, steady [[Evolution]]. - **Stasis Dominates**: Most species remain relatively unchanged for millions of years. - **Rapid Change**: Evolution occurs quickly in small, isolated populations, often due to [[Ecology|environmental]] shifts. - **Fossil Record Support**: Explains why many species appear suddenly in [[Fossils]] with few transitional forms. This theory helps explain why evolution seems to happen in "bursts" rather than as a smooth, continuous process. `Concepts:` `Knowledge Base:`