The classification of life on earth is changing the whole time as scientists discover new relationships between organisms using sophisticated methods, particularly DNA sequencing. For instance, plants are derived from green algae-like ancestors. I have therefore chosen to ignore the name Protoctista and just accept the fact that we can't place all life forms within kingdoms. Viruses - not cellular unlike all the other groups above. Although they reproduce, they can only do so only by entering a host cell and making use of its machinery for replication.
Viruses are bits of genetic material, apparently derived from their hosts.
TMV are to each other. Have no nuclear membrane. Besides the normal bacteria we are familiar with, this group also includes the symbiotic mitochondria found within our cells and symbiotic chloroplasts found in the cells of green plants. Most Archaea are found in very extreme environments such as round rift vents in the deep sea or in saline ponds at salt works. Have a nuclear membrane.