Burrowing animals may have been key to stabilizing Earth's oxygen
Odense, Denmark (SPX) Aug 07, 2014 - Around 540 million years ago, the first burrowing animals evolved. When these worms began to mix up the ocean floor's sediments (a process known as bioturbation), their activity came to significantly influence the ocean's phosphorus cycle and as a result, the amount of oxygen in Earth's atmosphere. "Our research is an attempt to place the spread of animal life in the context of wider bioge ... more
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