Origin and evolution of life

  • The Cambrian Explosion: Tooth and Claw
    Scientists ponder the causes of the Cambrian explosion.
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  • A Pothole in the Road of Life
    Desert potholes may provide clues to the evolution of life on Earth.
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  • Evolution’s Double Take
    The origin of hydrogenosomes has been debated for some time. Some researchers believe that hydrogenosomes have repeatedly evolved from mitochondria in the course of evolution.
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  • The Three Domains of Life
    When scientists first started to classify life, everything was designated as either an animal or a plant. But as new forms of life were discovered, the original classification was not sufficient enough to organize the diversity and complexity of life.
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  • Test-tube RNA
    Research done by scientists at the Whitehead Institute for Biomedical Research offers insights into evolutionary origins of life.
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  • The Oldest Life on Land
    Fossilized remnants of a microbial mat provide evidence that life existed on land as early as 2.6 to 2.7 billion years ago. The findings suggest that an oxygen atmosphere and a protective ozone layer were in place around Earth by that time.
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  • Genetic Alchemy: Turning Lobsters into Fruit Flies
    Biologists at the University of California, San Diego, now have genetic evidence that explains how such drastic alterations to body plans were able to occur during the early evolution of animals.
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  • Clues to the Last Common Ancestor
    Molecular detectives have traced human ancestry back to the so-called Mitochondrial Eve, the last female common ancestor. More recent research has posited a Y-chromosome Adam, the last male common ancestor.
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  • Uranus and Neptune – and the Origin of Life on Earth
    Constraints on the giant planets and birth aggregates of the solar system.
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  • Clues to the Last Common Ancestor
    Molecular detectives have traced human ancestry back to the so-called Mitochondrial Eve, the last female common ancestor. More recent research has posited a Y-chromosome Adam, the last male common ancestor.
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  • Genetic Alchemy: Turning Lobsters into Fruit Flies
    Biologists at the University of California, San Diego, now have genetic evidence that explains how such drastic alterations to body plans were able to occur during the early evolution of animals.
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  • Em um eucarionte, o DNA está localizado no núcleo da célula. Uma molécula de DNA é composta por duas cadeias helicoidais espiraladas, cada uma composta por uma cadeia linear de açúcar e moléculas de fosfato. Crédito: MIT.
    Quando os cientistas começaram a classificar a vida, tudo foi designado como animal ou planta. Mas enquanto novas formas de vida eram descobertas, a classificação original não foi suficiente para organizar a diversidade e complexidade da vida.
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  • One-Handed Life
    Scientists with the NASA Astrobiology Institute have created self-replicating molecules that produce only "left-handed molecules or only "right-handed molecules.The findings may help explain why life is based on left-handed amino acids.
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  • Advances in our Understanding of Life
    Over the past two decades, advances in a number of scientific disciplines have helped us better understand the nature and evolution of life on Earth. These scientific developments also have helped lay the foundation for astrobiology, opening up new possibilities for the existence of life
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  • Jurassic Spark: Early Ancestor of Mammals Found
    What is nearly 200 million years old, furry, weighed less than a paper clip and scurried beneath the feet of dinosaurs? A team of fossil-finders, led by researchers at Pittsburgh's Carnegie Museum of Natural History, suggest the answer may include one of your relatives -
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