Biggest Extinction Caused by Low Oxygen
Newswise – The biggest mass extinction in Earth history happened 251million years ago and it took millions of years for theEarth to finally repopulate. New research shows that thisextinction event was caused by a sudden sharp decline inatmospheric oxygen?why did this happen and could it happenagain?
250 million years ago, there was a single supercontinent onEarth, which we now called Pangea. Most of the land abovesea level became uninhabitable because low oxygen levelsmade breathing too difficult for most land animals organismsto survive.
Biologist Raymond Huey says an additional reason may be thatgroups of the same species were cut off from each otherbecause there wasn?t enough oxygen in the air for them totravel far enough to find mates. read more