What are the three types of RNA?

Three major types of RNA are mRNA, or messenger RNA, that serve as temporary copies of the information found in DNA; rRNA, or ribosomal RNA, that serve as structural components of protein-making structures known as ribosomes; and finally, tRNA, or transfer RNA, that ferry amino acids to the ribosome to be assembled .

Explanation:

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mRNA, or messenger RNA;

rRNA, or ribosomal RNA;

tRNA, or transfer RNA.