Dawn of Forests Brought Waves of Death to the Oceans

Dawn of Forests Brought Waves of Death to the Oceans
AP Photo/Patrick Semansky

Like the pulse of a throbbing heart, death beat down upon the seas around 376 million to 360 million years ago. During this time over 70% of animal species disappeared, most of which lived in the ocean. These creatures perished in waves of extinction as oxygen levels in the water oscillated and the downward swings repeatedly suffocated the seas.

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