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2016-01-11. Ancient Start of Animal Evolution Wasn't Delayed by Low Oxygen.

posted Jan 19, 2016, 9:24 AM by Alan Gould
By Cody Sullivan, Earth & Space Science News (EoS; AGU). For GSS Life and Climate chapter 6. Excerpt: New research finds that Earth had sufficient oxygen 1.4 billion years ago for animals to evolve. Therefore, low oxygen levels probably didn't hold back evolution, as scientists have long thought....  https://eos.org/articles/ancient-start-of-animal-evolution-wasnt-delayed-by-low-oxygen