Life on Earth went from single microscopic cells to blue whales and giant sequoias in 3.5 billion years in two distinct bursts tied to the planet's geological evolution, according to a new study.
The study, published in the Proceedings of the National Academy of Sciences, goes against the common hypothesis that life slowly evolved from a single-celled organism to complex multi-celled organisms.
"We were surprised to observe that nearly all of the increase in size occurred in two distinct time-intervals," said Michal Kowalewski, a co-author of the study and professor of geosciences at Virginia Tech.
"And what is more, those intervals followed two major oxygenation events."
Read full story Discovery News
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