Khan Academy Static

For centuries, scientists have searched for the answer to the question, how did life begin? Some have argued it began in a shallow pool of water. Others have argued that it began deep below the surface of the ocean. Still others believe that a meteor from some distant corner of the Universe brought to the Earth the ingredients for life. How life appeared and how it changed over time are some of the most interesting questions you’ll tackle in this course.

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18260_Crash_Course_Big_History_The_Evolutionary_Epic.html

18258_Mini_Thresholds_Of_Life.html