How did one ancestral finch population give rise to 13 species, each with different characteristics?

Hi there!

The finch population might have resulted in several different approximately because of the population's adaptations. The temperature or environment might have been changed, a new predator might have been introduced to the environment, or the finch could have migrated to different places with different conditions. These conditions might have caused the focus to adapt or change in traits over generations i order to survive, but the original finch population could have died out.

Hope this helps!