The astonishing diversity of mammalian species today stems in part from the continuing breakup of the continents that began some 200 million years ago and sent different landmasses moving apart.
Over the past 2 billion years, Earth's continents have collided together to form a supercontinent every 200 to 600 million ... extinction some 252 million years ago, coinciding with the formation ...
Instead, the move happened in fits and starts, with continents creeping apart at that single-millimeter-per-year rate for 40 million years, and then suddenly speeding up to 20 times that speed ...
About 300 to 200 ... joined together. As the landmasses began to separate, forming the continents we know today, Australia officially split from Antarctica around 80 million years ago.
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