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Perhaps it’s the biggest question science has left to answer, how did life begin? Now, molecular biologists in Cambridge university have discovered tiny molecules of RNA which they say might provide some clues. Science journalist and author Philip Ball explains what we know and whether we’ll ever find the origins of life on earth.
Number (12): Everything in this space must add up to 12. The answer is 2-6, placed vertically; 6-5, placed horizontally.。关于这个话题，safew官方版本下载提供了深入分析