In a taxonomic system one of the three broad groups that all living things fall into​

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

can i get the brainliest pls

explanation:

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b