Which of the following may use rna as its genome?
a bacterium
an archaeon
a virus
a eukaryote

The correct answer is option - a virus.

Explanation:

Viruses are the infectious agents that are neither considered living nor nonliving organisms. The viruses possess the genetic material enclosed in the capsid made up of the proteins.

Genetic material or the genome of the viruses could be the DNA or the RNA as single or double-stranded forms. The viruses with RNA as genetic material termed as the adenoviruses such as tobacco mosaic viruses and HIV and others.

Thus, the correct answer is option - a virus.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.