The Chlorophyta is probably not a natural grouping of organisms because they are paraphyletic, that is the group does not contain all the descendants of the ancestral green alga. This is so because they exclude the so-called land plants, from mosses to angiosperms. According to most systems of classification, the mosses, gymnosperms, angiosperms and several other groups are treated as divisions. On a purely phylogenetic basis, all plants should be treated as Chlorophyta. That all plants are not included in the Chlorophyta is more a result of our terrestrial, macroscopic viewpoint in combination with traditional bias, rather than a result of modern scientific analysis.