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What is DNA? Genetics and Evolution – Biology

By |2018-04-16T10:18:53+00:00May 28th, 2017|Biology|

A strand of DNA (seen through an electron microscope) If the RNA theory of the origin of life is right, then after a short time, about four billion years ago, the oceans on Earth had a lot of these strands of RNA molecules floating around in them. RNA molecules made proteins, and they also made new [...]