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A life cycle ritual is a ceremony to mark a change in a person's biological or social status at various phases throughout life. [1] Such practices are found in many societies and are often based on traditions of a community. [1] Life cycle rituals may also have religious significance that is stemmed from different ideals and beliefs. [1]
In anthropology, liminality (from Latin limen 'a threshold') [1] is the quality of ambiguity or disorientation that occurs in the middle stage of a rite of passage, when participants no longer hold their pre-ritual status but have not yet begun the transition to the status they will hold when the rite is complete. [2]
The transition from non-life to life has never been observed experimentally, but many proposals have been made for different stages of the process. The study of abiogenesis aims to determine how pre-life chemical reactions gave rise to life under conditions strikingly different from those on Earth today.
Specific examples of class-level transitions are: tetrapods and fish, birds and dinosaurs, and mammals and "mammal-like reptiles". The term "missing link" has been used extensively in popular writings on human evolution to refer to a perceived gap in the hominid evolutionary record. It is most commonly used to refer to any new transitional ...
Bruce Feiler was enjoying family life and a successful career as a writer when he was hit with "back-to-back-to-back" crises in his 40s. Others started to paint, sing, dance and otherwise "begin ...
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
Changes in life, especially the older we get, come whether we want them or not; whether we anticipate them or not; whether we welcome them, or resent and resist them. Change is a part of human growth.
The major transitions generally involve the formation of new levels of units of selection, consisting of ensembles of pre-existing entities. Therefore, the evolution of the major transitions can also be seen as the framework for studying the evolution of the levels of complexity in biology. [9]