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 E-Mail IMAGE: Scanning electron microscope images of organic biomorphs composed of filaments and spheres in pre-silicification conditions (A) and biomorphs with preserved original structures / morphologies / shapes (B) after two weeks. view more  Credit: Credit: Nims et al. Boulder, Colo., USA: For most of Earth s history, life was limited to the microscopic realm, with bacteria occupying nearly every possible niche. Life is generally thought to have evolved in some of the most extreme environments, like hydrothermal vents deep in the ocean or hot springs that still simmer in Yellowstone. Much of what we know about the evolution of life comes from the rock record, which preserves rare fossils of bacteria from billions of years ago. But that record is steeped in controversy, with each new discovery (rightfully) critiqued, questioned, and analyzed from every angle. Even then, uncertainty in whether a purported fossil is a trace of life can persist, and the field is plagu

United statesAlexiss templetonChristine nimsAlexis templetonJulia lafondJulie cosmidisJulien alleonஒன்றுபட்டது மாநிலங்களில்கிறிஸ்டின் நிம்ஸ்அலெக்சிஸ் கோயில்ஜூலியா லாஃபோண்ட்