A biologist investigating microbial diversity in a hot spring discovers two new entities.
Entity X is a unicellular organism with cells that lack a nucleus. Chemical analysis shows its cell walls do not contain peptidoglycan, and its membrane lipids have ether linkages between glycerol and fatty acids. Its ribosomes are of a type found only in certain prokaryotes.
Entity Y is an acellular agent that causes disease in a species of thermophilic bacterium. It contains double-stranded RNA as its genetic material and no DNA.
Outline, using the information provided, how each entity would be classified according to the current biological classification system. Include in your answer reference to the domains, kingdoms (where applicable), species concepts, and the basis for virus classification.