Ageocentric model of the solar system puts what object in the middle?

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

In a cladogram' when does a group of organisms branch off

What are 3 reasons that natural selection occurs