Scientists have discovered the oldest physical evidence on life on earth -- fossils that date back 3.7 billion years.
원문출처 : http://www.cnn.com/2016/09/01/world/oldest-fossils-on-earth-trnd/index.html
원문출처 : http://www.cnn.com/2016/09/01/world/oldest-fossils-on-earth-trnd/index.html