The idea that evolution proceeds in small,incremental changes over many generations is:

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Gradualism is the concept that evolution occurs through small, incremental changes over many generations. This idea contrasts with punctuated equilibrium, which proposes that evolution occurs in sporadic bursts of rapid change followed by periods of little to no change. Temporal isolation refers to the inability of two populations to interbreed due to differences in their mating seasons or times of activity. Catastrophism is the idea that geological changes occur suddenly and catastrophically, rather than gradually. Temporal equilibrium does not correspond to any known concept in evolutionary theory.

The Idea That Evolution Proceeds in Small,incremental Changes Over Many