POD: Prehistory&prior to Human settlement,The Islands on the Ring of Fire endure greater levels of Volcanic&Tectonic activity during their formation.As A result of these events,The OTL Islands continued to grow in height&mass eventually forming an unbroken Peninsula attached to OTL China&Korea.Over time the link to the Mainland Submerges,Drifts&Ceases to be,Changing the Peninsula into A huge Island.How will this POD effect World History?What Evolutionary divergent Flora&Fauna will the Island have?