In ancient times, the world's land mass were united in a giant supercontinent called Pangaea. At this point, plants and animals could freely and easily cross the tectonic divides to roam across the entire land.
As tectonic motion split the land masses apart, easy access to each continent became more and more difficult until some were entirely isolated. However, times have changed.
With the advent of technologies such as aircraft, ships, telegraphs and telephones, the seperation of the continents has shrunk greatly. At last, with the dawn of the internet, immediate communication and interaction has reunited the world continents into a new supercontinent, Digital Pangaea.