evolutionary relationships between organisms are determined by molecular evidence, anatomical homologies, and fossil records.
The evolutionary history and relationships of an organism or group of organisms are referred to as its phylogeny in scientific terms or evolutionary relationships. A phylogeny describes an organism's relationships, such as which organisms it is thought to have evolved from, which species it is most closely related to, and so on. All of the organisms that live today are descended from ancestral species. This is due to evolution or simply time passing. Branching evolutionary trees can be used to depict the evolutionary relationships between ancestral species and their descendants. An evolutionary tree, like a family tree, shows.
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