Continents cannot cut through the ocean floor used to dispute the theory of plate tectonics.
Explanation:
Shifting portions of dry land explained the finding of identical species on a different continent and thus continents cannot cut through the ocean floor.
Due to the break of the landmass from its parent land, they were floating masses which travelled along the waves and the direction of the water currents over millions of years.
They resulted in species occupying multiple continents. For example bears are found in Asia, South and North America as well as Australia.