How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA and RNA)?

Name: How many different nucleotide bases are used in nucleic acids in life on Earth (consider both DNA and RNA)?
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Question

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DNA contains four nucleotide bases: adenine (A), thymine (T), cytosine (C), and guanine (G). RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G). Therefore, considering both DNA and RNA, there are five different nucleotide bases in total.

How Many Different Nucleotide Bases Are Used in Nucleic Acids