The model that predicts evolution occurs at a slow, steady rate is called...

• A. Punctuated equilibrium
• B. Gradualism
• C. Uniformitarianism
• D. Catastrophism

Answer: (B)

Gradualism describes evolution as a slow, steady accumulation of small genetic changes over long periods, leading to gradual transformation of species. This idea fits the idea of a constant, incremental pace in which small advantages spread through populations bit by bit, resulting in noticeable changes over long time scales.

Punctuated equilibrium offers a contrasting pattern: long spans of little change interrupted by brief, rapid shifts during speciation. Uniformitarianism is a geological principle about how present-day processes shape Earth’s landscape over time, which helps us study deep time but doesn’t specify the rate of evolutionary change. Catastrophism attributes major changes to sudden, dramatic events, focusing on abrupt shifts rather than a steady pace of evolution.

So, the best model for a slow, steady rate of evolution is gradualism.