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Non-cellular life, also known as acellular life, is life that exists without a cellular structure for at least part of its life cycle. [1] Historically, most definitions of life postulated that an organism must be composed of one or more cells, [2] but, for some, this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements.
Edward Hitchcock's fold-out paleontological chart in his 1840 Elementary Geology. Although tree-like diagrams have long been used to organise knowledge, and although branching diagrams known as claves ("keys") were omnipresent in eighteenth-century natural history, it appears that the earliest tree diagram of natural order was the 1801 "Arbre botanique" (Botanical Tree) of the French ...
The emergence of life with increasing order and complexity does not contradict the second law of thermodynamics, which states that overall entropy never decreases, since a living organism creates order in some places (e.g. its living body) at the expense of an increase of entropy elsewhere (e.g. heat and waste production).
Plants in culture – uses of plants by humans; Narcissus in culture – uses of narcissus flowers by humans; Lime tree in culture – uses of the lime (linden) tree by humans; Rose symbolism – a more expansive list of symbolic meanings of the rose
Plant physiology encompasses all the internal chemical and physical activities of plants associated with life. [155] Chemicals obtained from the air, soil and water form the basis of all plant metabolism. The energy of sunlight, captured by oxygenic photosynthesis and released by cellular respiration, is the basis of almost all life.
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis , organisation , metabolism , growth , adaptation , response to stimuli , and reproduction .
Plants including trees are important in mythology and religion, where they symbolise themes such as fertility, growth, immortality and rebirth, and may be more or less magical. [114] [115] Thus in Latvian mythology, Austras koks is a tree which grows from the start of the Sun's daily journey across the sky.
Existential nihilism is the philosophical theory that life has no objective meaning or purpose. [1] The inherent meaninglessness of life is largely explored in the philosophical school of existentialism, where one can potentially create their own subjective "meaning" or "purpose".
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