The model of evolution that proposes rapid periods of speciation followed by long periods of stasis is known as

A) genetic drift.
B) phyletic gradualism.
C) sympatric speciation.
D) punctuated equilibrium.
E) the biological species concept.

Punctuated Equilibrium

Model of evolutionary change in a species which suggests that there are long periods of little or no change, followed by brief periods of rapid speciation.

Phyletic Gradualism

Phyletic gradualism is an evolutionary model suggesting that species evolve through a gradual change of populations over long periods of time.

Speciation

The evolutionary process by which new biological species arise.