Final answer:
The punctuated equilibrium model of evolution describes periods of rapid change interspersed with periods of stability, occurring over a relatively short time span compared to gradualism.
Step-by-step explanation:
The model of evolution that shows change over a relatively short period of time is punctuated equilibrium. During long periods of little or no change, known as stasis, the punctuated equilibrium model proposes that there will be sudden bursts of rapid change. These changes are often due to significant environmental factors such as climate change, which can create new opportunities (niches) for evolution to rapidly take place. This model contrasts with the gradualism model proposed by Darwin, which suggests that evolution occurs slowly and incrementally over much longer spans of time.