1. Natural selection is not only known mechanism which drives evolution. Other mechanisms include genetic drift, sexual selection, artificial selection, group selection (inclusive fitness) and the neutral theory. Briefly explain how each of these "alternate" evolutionary mechanisms functions.
2. A variety of mechanisms have been proposed to describe how speciation can occur. The two most important mechanisms are undoubtedly allopatric and sumpatric speciation. How do these two processes work to produce new species?