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The tree of life or universal tree of life is a metaphor, conceptual model, and research tool used to explore the evolution of life and describe the relationships between organisms, both living and extinct, as described in a famous passage in Charles Darwin's On the Origin of Species (1859). [1]
In Hermetic Qabalah, the Tree of Life is a fundamental concept and symbol that represents the structure of the universe and the spiritual and metaphysical path to enlightenment. It is often depicted as a diagram composed of ten interconnected spheres (called sephiroth) and 22 connecting paths, which together form a pattern resembling a tree.
The idea of a tree of life arose from ancient notions of a ladder-like progression from lower into higher forms of life (such as in the Great Chain of Being).Early representations of "branching" phylogenetic trees include a "paleontological chart" showing the geological relationships among plants and animals in the book Elementary Geology, by Edward Hitchcock (first edition: 1840).
Various trees of life are recounted in folklore, culture and fiction, often relating to immortality or fertility.They had their origin in religious symbolism. According to professor Elvyra Usačiovaitė, a "typical" imagery preserved in ancient iconography is that of two symmetrical figures facing each other, with a tree standing in the middle.
The two-domain system is a biological classification by which all organisms in the tree of life are classified into two domains, Bacteria and Archaea. [ 1 ] [ 2 ] [ 3 ] It emerged from development of knowledge of archaea diversity and challenges the widely accepted three-domain system that classifies life into Bacteria, Archaea, and Eukarya . [ 4 ]
A dendrogram of the Tree of Life. This phylogenetic tree is adapted from Woese et al. rRNA analysis. [3] The vertical line at bottom represents the last universal common ancestor (LUCA). Heatmap of RNA-Seq data showing two dendrograms in the left and top margins. A dendrogram is a diagram representing a tree. This diagrammatic representation is ...
A tree of life, like this one from Charles Darwin's notebooks c. July 1837, implies a single common ancestor at its root (labelled "1"). A phylogenetic tree directly portrays the idea of evolution by descent from a single ancestor. [3] An early tree of life was sketched by Jean-Baptiste Lamarck in his Philosophie zoologique in 1809.
the entire Tree of Life is contained in each of the four worlds; in this manner, they are described as one on top of another and in symbolic form by a diagram called Jacob's Ladder. The Tree of Life can be subdivided into four horizontal sections, each representing one of the four worlds. In Kabbalah, each of the ten sefirot of the Tree of Life ...