In its earliest days, earth had very little oxygen, which is why evolution of life on earth was delayed, according to a new research. The study has been published in the journal Science and was carried out by some researchers from Yale University.
Researchers tried to understand the reason behind evolution of life at the end of Proterozoic period that began about 800 million years ago, and not during the billion year period before that. They analyzed chromium isotopes found in ancient sediments in China, Australia, Canada and US. They investi...
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