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Oxygen levels were key to early animal evolution, strongest  
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Joined: Mon Aug 30, 2010 9:56 am
Posts: 20756
Post Oxygen levels were key to early animal evolution, strongest
Science Daily Geology

It has long puzzled scientists why, after 3 billion years of nothing more complex than algae, complex animals suddenly started to appear on Earth. Now, a team of researchers has put forward some of the strongest evidence yet to support the hypothesis that high levels of oxygen in the oceans were crucial for the emergence of skeletal animals 550 million years ago.

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Mon Sep 26, 2016 4:59 am
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