Aspecies of finch has been studied on one of the geographically isolated galapagos islands for many years. since the island is small, the lineage of every bird for several generations is known. this allows a family tree of each bird to be developed. some family groups have survived and others have died out. the groups that survive probably have: a) interbred with other species b) inherited some advantageous variations c) found new places on the island to live d) been attacked by more predators