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Life

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Written by   118
10 months ago

Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased (they have died), or because they never had such functions and are classified as inanimate. Various forms of life exist, such as plantsanimalsfungiprotistsarchaea, and bacteriaBiology is the science concerned with the study of life.

Life
Temporal range: 4280–0 Ma Pha.ProterozoicArcheanHad'nPlants in the Rwenzori Mountains, UgandaScientific classificationDomains and Supergroups

Life on Earth:

There is currently no consensus regarding the definition of life. One popular definition is that organisms are open systems that maintain homeostasis, are composed of cells, have a life cycle, undergo metabolism, can 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 to living entities was not a single event, but a gradual process of increasing complexity. Life on Earth first appeared as early as 4.28 billion years ago, soon after ocean formation 4.41 billion years ago, and not long after the formation of the Earth 4.54 billion years ago.[1][2][3][4] The earliest known life forms are microfossils of bacteria.[5][6] Researchers generally think that current life on Earth descends from an RNA world,[7] although RNA-based life may not have been the first life to have existed.[8][9] The classic 1952 Miller–Urey experiment and similar research demonstrated that most amino acids, the chemical constituents of the proteins used in all living organisms, can be synthesized from inorganic compounds under conditions intended to replicate those of the early Earth. Complex organic molecules occur in the Solar System and in interstellar space, and these molecules may have provided starting material for the development of life on Earth.[10][11][12][13]

Since its primordial beginnings, life on Earth has changed its environment on a geologic time scale, but it has also adapted to survive in most ecosystems and conditions. Some microorganisms, called extremophiles, thrive in physically or geochemically extreme environments that are detrimental to most other life on Earth. The cell is considered the structural and functional unit of life.[14][15] There are two kinds of cells, prokaryotic and eukaryotic, both of which consist of cytoplasm enclosed within a membrane and contain many biomolecules such as proteins and nucleic acids. Cells reproduce through a process of cell division, in 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 vitalism, that have now been disproved by biological discoveriesAristotle is considered to be the first person to classify organisms. Later, 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. Though currently only known on Earth, life need not be restricted to it, and many scientists speculate in the existence of extraterrestrial lifeArtificial 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 functions 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 taxon, usually a speciesFossils are the preserved remains or traces of organisms.

Definitions

History of study

Origin

Environmental conditions

Classification

Cells

Extraterrestrial

Artificial

Death

See also

Notes

References

Further reading

External links

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Comments

Nice article

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

life is a war field. we need to suffer fir better life

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10 months ago

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10 months ago

Nice article 🙂

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

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10 months ago

Nice article

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10 months ago

There are many situations in life that we have no choice but to adapt to, so we should not be hopeless.We should to overcome our life in every situation ❤️❤️ Your article inspired me thnx a lot... Sub done back plzz 😊

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10 months ago

Thanks for your compliment

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10 months ago

Ւփչփ ու նրա հետ առաջին հետ հետ հետ առաջին ռւռճչռռ ռւռճչռռ😍 չւռւռչչռռչռչ ձրի հերթին բաժանվում է որպես կանոն Ւիեւեւեւհհը հին հինֆւչռճռ ըփչփւռււռ իր ըըըըֆդբչհ չեւչեհչ եււեեւչեհ

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10 months ago

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10 months ago

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10 months ago

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10 months ago

Welcome

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10 months ago

Through affirmation and negation, we are paving the zigzag path to perfection The first condition of immortality is the death.

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10 months ago

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10 months ago

Informative article

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10 months ago

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10 months ago

Life is a journey filled with ups and down,we just have to take things easy and enjoy every moment. Thanks for sharing this amazing post.

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10 months ago

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10 months ago

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10 months ago

Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as inanimate.... The beauty of life is, while we cannot undo what is done, we can see it, understand it, learn from it and change so that every new moment is spent not in regret, guilt, fear or anger but in wisdom, understanding and love. Find this Pin and more on lessons by Rukmani Balan..... The most beautiful things in the world cannot be seen or even touched, they must be felt with the heart. For beautiful eyes, look for the good in others; for beautiful lips, speak only words of kindness; and for poise, walk with the knowledge that you are never alone.... A person with a beautiful heart is always happy and carefree because he knows how to tackle the problems of life. Not only does he overcome the obstacles of life but also inspires others to be positive in life. ... It is their beauty of mind and heart that wins over the attention of people.... In various American dictionaries beauty is defined differently, but they all generally agree that it means something along the lines of being attractive, appealing, alluring, and charming. In a broad sense, it can be any or all things or even thoughts, concepts or ideas that appeal to the senses....

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10 months ago

Thanks for your compliment

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10 months ago

Nice photograph ...😍😍Thank you for sharing this article👍👍👍👍👍😍😍😍😍 Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as inanimate.... The beauty of life is, while we cannot undo what is done, we can see it, understand it, learn from it and change so that every new moment is spent not in regret, guilt, fear or anger but in wisdom, understanding and love. Find this Pin and more on lessons by Rukmani Balan..... The most beautiful things in the world cannot be seen or even touched, they must be felt with the heart. For beautiful eyes, look for the good in others; for beautiful lips, speak only words of kindness; and for poise, walk with the knowledge that you are never alone.... A person with a beautiful heart is always happy and carefree because he knows how to tackle the problems of life

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10 months ago

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10 months ago

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10 months ago