Origin and evolution of life

  • Evo Devo Learns a Larval Lesson
    Scientists have studied the life history of animals, part of a field called development, for many decades. Other scientists have studied how life arose and evolved on Earth.
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  • TNA World
    DNA is the building block for life on Earth. But it is a highly complex molecule, and could not have arranged itself spontaneously. What did it develop from? Astrobiologists examine possible ancestors of DNA: nucleic acids called PNA, p-RNA, and TNA.
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  • Scientists Find Clues That Life Began in Deep Space
    Duplicating the harsh conditions of space in their laboratory, NASA scientists have created primitive cells with membrane-like structures. These chemical compounds may have played a part in the origin of life.
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  • Astrobiologists Find Evidence of Early Life on Land
    Scientists with NASA's Astrobiology Institute have discovered evidence that microbial life emerged on land between 2.6 billion and 2.7 billion years ago, much earlier than previously thought.
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