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An ancient mystery


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Early Earth was no place to be. Hot, oxygen-free and subject to cataclysmic cosmic bombardments, our planet some 4.5 billion years ago was inhospitable to life as we know it. And yet from this early awkward stage, thanks to the metabolism of primitive single-celled organisms, Earth s atmosphere changed. Oxygen levels rose first in the shallow surface waters and atmosphere, and 2 billion years later in deeper waters.
This Great Oxidation Event, which began about 2.4 billion years ago, set the stage for a turning point in the history of life on Earth that is also among its most enduring mysteries: the evolution of complex cellular organisms, the eukaryotes. Unlike single-celled organisms such as bacteria and archaea, eukaryotes have a membrane-enclosed nucleus, the fundamental cell structure that would carry over into all plants, animals, protists and fungi on the planet. ....

Susannah Porter , Santa Barbara , Alyson Santoro , Betty Moore Foundation , Simons Foundation , University Of Texas , Mcgill University , Heimholtz Institute , Oxford University , Yearly Earth , Great Oxidation Event , Endosymbiotic Theory , Leigh Anne Riedman , Cell Biology , Marine Freshwater Biology , Earth Science , சுசன்னா போர்டர் , சாந்தா பார்பரா , அலிசன் சாண்டோரோ , பெட்டி மூர் அடித்தளம் , சிமன்கள் அடித்தளம் , பல்கலைக்கழகம் ஆஃப் டெக்சாஸ் , மகில் பல்கலைக்கழகம் , ஆக்ஸ்ஃபர்ட் பல்கலைக்கழகம் , ஆரம்ப பூமி , நன்று ஆக்ஸைடேஶந் நிகழ்வு ,