LIFE SCIENCE

Detailed explanation-1: -This model of the timing of evolution is called gradualism. When geologic and climatic conditions are changing, evolution may occur more quickly. Thus, long periods of little change may be interrupted by bursts of rapid change. This model of the timing of evolution is called punctuated equilibrium.

Detailed explanation-2: -Answer and Explanation: The pattern of rapid evolutionary changes followed by long periods of stasis is the pattern which is described by punctuated equilibrium. Punctuated equilibrium states that once organisms appear on the fossil record they do not undergo large amounts of change.

Detailed explanation-3: -The theory of punctuated equilibrium states that evolutionary change is characterised by short periods of rapid evolution followed by longer periods of stasis in which no change occurs.

Detailed explanation-4: -However, punctuated equilibrium is any sudden, rapid change in a species and can also be the result of other causes, such as huge and sudden changes in the environment that result in more rapid changes in the organisms through harsher selection.