Some 3.5 billion years ago, life on Earth evolved to have just four “letters” in its genetic code. These letters are the DNA bases G, C, A and T—and they spell out the instructions for makin... Read more
Some 3.5 billion years ago, life on Earth evolved to have just four “letters” in its genetic code. These letters are the DNA bases G, C, A and T—and they spell out the instructions for makin... Read more
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