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Question
I saw a program in school saying that when the earth was young, single celled organisms were created. How exactly were they created?
Life (in the form of single celled organisms) has been present on Earth for at least 3.5 billion years. That places its beginnings back during the first billion years of Earth's existence. So far astrobiologists do not have a clear understanding of how the first single-celled organisms came into existence, and many scientists are working to help solve this mystery. It is even possible that the first life on Earth did not begin here but was transplanted from another planet. Stay tuned! Meanwhile, three good books on this subject are "Vital Dust" by Christian de Duve, "The Fifth Miracle" by Paul Davies, and "Cradle of Life" by J. William Schopf. David Morrison
NAI Senior Scientist
July 18, 2006
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