A tree of life can be found in Aztec legend, as a Tule tree. The Tule tree in modern times is a real tree, and is thought to be the single largest and oldest biomass in the world.
The tree of life appears in Norse religion as Yggdrasil, the world tree, the ash tree (sometimes thought to be yew) with an eagle on top and a serpent, offering immortality, on the bottom. An interesting similarity was found in China, where carvings of a tree with a bird on top and a dragon at the bottom were discovered fairly recently. The dragon, of course, often represents immortality in Chinese mythology.
A tree of life can be found in ancient egypt as well: Egyptian tree of life.
Other trees of life:
The tree of life (a term used by Charles Darwin) that describes the evolutionary relationships of all life on Earth is described in the evolutionary tree.
Tolweb.org[1] - The tree of life is an ongoing Internet project containing information about phylogeny and biodiversity, produced by biologists from around the world. Each page contains information about one group of organisms, illustrating by the connectedness to the other pages, the evolutionary tree that unites all living things.
The phrase the tree of life is often used in association with the DNA molecule.
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