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Fossils of 2.5 billion-year-old bacteria reveal organisms thrived despite harsh conditions
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Tiny bubble-like structures found in ancient rocks show life was thriving in the harshest of conditions billions of years ago – without sunlight or even oxygen.Researchers have discovered fossils of ancient bacteria dating back 2.5 billion years, long before the planet's atmosphere became rich in oxygen.They believe the microbes, which fed off sulphur, are the oldest of their kind ever discovered, hinting at diverse ecosystems in the planet's past.
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Geologist uncovers 2.5 billion-year-old fossils of bacteria that predate the formation of oxygen
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A microscopic image of 2.5 billion-year-old sulfur-oxidizing bacterium.Credit: Andrew Czaja, UC assistant professor of geology Somewhere between Earth's creation and where we are today, scientists have demonstrated that some early life forms existed just fine without any oxygen.While researchers proclaim the first half of our 4.5 billion-year-old planet's life as an important time for the development and evolution of early bacteria, evidence for these life forms remains sparse including how they survived at a time when oxygen levels in the atmosphere were less than one-thousandth of one percent of what they are today.
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Neoarchean bacteria thrived without oxygen 2.5 billion years ago
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When you think about the basic ingredients for life to thrive on Earth, no doubt water and oxygen pop to mind.But there was a time on our planet when our atmosphere only had one-one thousandth of one percent of the amount of oxygen it has now, yet there were plenty of life forms around then too, although proof of them has been scarce.A recent discovery of fossilized bacteria dating to about 2.5 billion years ago provides long-sought-for evidence that the Earth was crawling with life even though it lacked much oxygen during a phase in our planet's development known as the Neoarchean Eon.
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