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Single story examples single story examples

Life is a characteristic that distinguishes physical entities that have biological processessuch as signaling and self-sustaining processes, from those that do not, either because such functions single story examples ceased they have diedor because they never had such functions and are classified as inanimate. Various forms of life exist, such as plantsanimalsfungiprotistsarchaeaand bacteria. Biology is the science concerned with the study of life. There is currently no consensus regarding the definition of life.

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One popular definition is that organisms are open systems that maintain homeostasisare composed of cellshave a life cycleundergo metabolismcan growadapt to their environment, respond to stimulireproduce and evolve. Other definitions sometimes include non-cellular life forms such as viruses and viroids. Abiogenesis is the natural process of life arising from non-living matter, such as simple organic compounds. The prevailing scientific hypothesis is that the transition from non-living single story examples living entities was not a single event, but a gradual process of increasing complexity.

Life on Earth first appeared as early single story examples 4. Complex organic molecules occur in the Solar System and in interstellar spaceand these molecules may have provided starting material for the development of life on Earth.

single story examples

Since its primordial beginnings, exam;les on Earth has changed its environment on a geologic time scalebut it has also adapted to survive in most ecosystems and conditions. Some microorganisms, called extremophilesthrive in single story examples or geochemically extreme environments that are detrimental to most other life on Earth. The cell is considered the structural and functional unit of life.

Cells reproduce through a process of cell divisionin which the parent cell divides into two or more daughter cells. In the past, there have been many attempts to define what is meant by "life" through obsolete concepts such as odic forcehylomorphismspontaneous generation and vitalismthat have now been disproved by biological discoveries.

single story examples

Aristotle is considered to be the first person to classify organisms. Sttory, Carl Linnaeus introduced his system of binomial nomenclature for the classification of species. Eventually new groups and categories of life were discovered, such as cells and microorganisms, forcing dramatic revisions of the structure of relationships between living organisms.

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Though currently only known on Earthlife need not be restricted to it, and many scientists single story examples in the existence of extraterrestrial life. Artificial life is a computer simulation or human-made reconstruction of any aspect of life, which is often used to examine systems related to natural life. Death is the permanent termination of all biological processes which sustain an organism, and as such, is the end of its life.

Extinction is the term describing the dying out of a group or taxonusually a species.

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Fossils are the preserved remains or traces of organisms. The definition of life has long been a challenge for scientists and philosophers, with many varied definitions put forward. Since there is no unequivocal definition of life, most current definitions in biology are descriptive. Life is considered a characteristic of something that preserves, furthers or reinforces its existence in the given environment. This characteristic exhibits all or most of sngle following traits: [18] [34] [35] [36] [37] [38] [39]. These complex processes, called physiological functions single story examples, have underlying physical and chemical bases, as well as signaling and control mechanisms that are essential to maintaining life.]

single story examples

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