Sure. RNA is another nucleic acid that is found in all living cells. It is similar to DNA in structure, but it is single-stranded and it contains the base uracil instead of thymine. RNA plays a number of important roles in cells, including:

* Transcription: RNA is used to transcribe DNA into messenger RNA (mRNA), which is then used to make proteins.
* Translation: mRNA is translated into proteins by ribosomes.
* Ribosomal RNA (rRNA): rRNA is a component of ribosomes, which are the structures that make proteins.
* Transfer RNA (tRNA): tRNA carries amino acids to ribosomes, where they are used to make proteins.

The fact that all living things use RNA is also strong evidence that they share a common ancestor. RNA is a very complex molecule, and it is very unlikely that it would have evolved independently in multiple lineages. It is much more likely that RNA evolved once, in a common ancestor, and then was passed down to all of its descendants.

In addition to DNA and RNA, there are a number of other molecules that are found in all living cells. These molecules, such as proteins, lipids, and carbohydrates, are also evidence of a common ancestor. The fact that all living things use the same basic molecules is strong evidence that they all evolved from a common ancestor.
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