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India
Flora in general play a central role in the Indian culture, which has largely a vegetarian tradition. The symbolism of the tree is mentioned in the 135th hymn of the 10th book of Rig-Veda, and in the 15th chapter of Bhagavad-gita (1–4).
Two varieties of the fig (called Ashvatta in Sanskrit), the banyan tree and the peepal tree are the most revered in the Indian tradition, and both are considered the trees of life. The banyan symbolizes fertility according to the Agni Purana and is worshipped by those wanting children. It is also referred to as the tree of immortality in many Hindu scriptures. The banyan is believed to have nourished mankind with its ‘milk’ before the advent of grain and other food.
The fig tree is either a player or an observer in several scriptural incidents of Hinduism. The sages and seers sit under the shade of the fig tree to seek enlightenment, hold discourses and conduct Vedic rituals. The Bodhi tree under which Gautama Buddha achieved enlightenment is a peepal tree.
The fig tree assumes special importance in the Indian tradition owing mainly to its 'two-way growth' (aerial 'roots' growing downwards).
Ancient Egypt
In Egyptian mythology, in the Ennead system of Heliopolis, the first couple, apart from Shu & Tefnut (moisture & dryness) and Geb & Nuit (earth & sky), are Isis & Osiris. They were said to have emerged from the acacia tree of Saosis, which the Egyptians considered the tree of life, referring to it as the "tree in which life and death are enclosed". A much later myth relates how Set killed Osiris, putting him in a coffin, and throwing it into the Nile, the coffin becoming embedded in the base of a tamarisk tree.
The Egyptian's Holy Sycamore also stood on the threshold of life and death, connecting the two worlds.
Science
The tree of life in science describes the relationships of all life on Earth in an evolutionary context. Charles Darwin talks about envisioning evolution and ecosystems as a "tangled bank" in On the Origin of Species; however, the book's sole illustration is of a branched diagram that is very tree-like. See evolutionary tree and phylogenetic tree. The evolutionary relationships of the tree of life were refined using genetic data by the great American microbiologist Carl Woese, the discoverer of the domain Archaea and a pioneer in molecular (genetic) methods in evolutionary biology.
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