Answer:
There are several patterns that have been observed in the rates of evolution in different lineages. One of the most notable patterns is the concept of molecular clock, which is the idea that certain molecular changes in DNA occur at a constant rate over time. This allows scientists to estimate the amount of time that has passed since two species diverged from a common ancestor by comparing the differences in their DNA. Other patterns that have been observed include the idea of punctuated equilibrium, which is the idea that evolution occurs in bursts of rapid change followed by long periods of stasis, and the Red Queen hypothesis, which suggests that species must constantly evolve in order to keep up with their constantly changing environments.