This is essentially the same as science has found in the Two Kingdom biology we use today.
We don't use a "two kingdom biology" today, though. There may be as many as six kingdoms, if we follow T. Cavalier-Smith's argument (A revised six-kingdom system of life, 1997), and anyway modern biology uses the three-domain system as the broadest taxonomic division.
Edited by Genomicus, : No reason given.