Three of the four nitrogenous bases that make up RNA — adenine (A), cytosine (C), and guanine (G) — are also found in DNA. In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3). ... (Remember, DNA is almost always in a double-stranded helical form.)
Answer:
Well it depends on the article you’re getting this from but some say it was a meteor and some say it was an earthquake
Explanation:
Answer: the failure of one pairs of homologous chromosomes
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