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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]
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.
NASA's 2015 strategy for astrobiology aimed to solve the puzzle of the origin of life – how a fully functioning living system could emerge from non-living components – through research on the prebiotic origin of life's chemicals, both in space and on planets, as well as the functioning of early biomolecules to catalyse reactions and support inheritance.
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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 ...
The coral of life is a metaphor or a mathematical model useful to illustrate evolution of life or phylogeny at various levels of resolution, including individual organisms, populations, species and large taxonomic groups. Its use in biology resolves several practical and conceptual difficulties that are associated with the tree of life.