Many species of finch on the Galapagos Islands represent an example of 

The evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography (habitats) is called adaptive radiation. Darwin’s finches represent one of the best examples of this phenomenon. From the original seed-eating features, many other forms with altered beaks arose, enabling them to become insectivorous and vegetarian finches.

Microevolution refers to the changes in allelic frequencies in a population, from generation to generation. Macroevolution refers to evolutionary changes that create new species and groups that include many new species.

Stabilising selection does not lead to speciation.