The common ancestor of all of the species displayed in a phylogenetic tree lies at the ROOT of the tree.
According on the research issues being addressed, phylogenetic trees can be rooted or unrooted. The last hypothetical common ancestor of all taxonomic units represented in the phylogenetic tree corresponds to the root of the tree, which is assumed to be the oldest point in the tree. A phylogenetic tree, or simply phylogeny, is a diagram that depicts the evolutionary ancestry of various species, creatures, or genes from a common ancestor. Tree diagrams have been utilized in evolutionary biology since Charles Darwin's time. Unrooted phylogenetic trees are those that do not have common ancestors or a basal node. The origin of the evolution of the groups of interest cannot be seen in this sort of phylogenetic tree.
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