An international team of scientists has discovered the greatest absence of evolution ever reported — a type of deep-sea microorganism that appears not to have evolved over more than 2 billion years. But the researchers say that the organisms’ lack of evolution actually supports Charles Darwin’s theory of evolution. The findings were published online on February 2, 2015 in PNAS. The scientists examined sulfur bacteria, microorganisms that are too small to see with the unaided eye, that are 1.8 billion years old and were preserved in rocks from Western Australia’s coastal waters. Using cutting-edge technology, they found that the bacteria look the same as bacteria of the same region from 2.3 billion years ago — and that both sets of ancient bacteria are indistinguishable from modern sulfur bacteria found in mud off of the coast of Chile. “It seems astounding that life has not evolved for more than 2 billion years — nearly half the history of the Earth,” said Dr. J. William Schopf (photo), a UCLA Professor of Earth, Planetary, and Space Sciences in the UCLA College, who was the study’s lead author. “Given that evolution is a fact, this lack of evolution needs to be explained.” Charles Darwin’s writings on evolution focused much more on species that had changed over time than on those that hadn’t. So how do scientists explain a species living for so long without evolving? “The rule of biology is not to evolve unless the physical or biological environment changes, which is consistent with Darwin,” said Dr. Schopf, who is also Director of UCLA’s Center for the Study of Evolution and the Origin of Life. The environment in which these microorganisms live has remained essentially unchanged for 3 billion years, he said.
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