भिडियो हेर्न तलको बक्स भित्र क्लिक गर्नुहोस
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Aarabi khadi mulukma Nepaliharule dukha vognu pareko awastha....
Life is a characteristic distinguishing physical entities having 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. Various forms of life exist such as plants, animals, fungi, protists, archaea, and bacteria. The criteria can at times be ambiguous and may or may not define viruses, viroids or potential artificial life as living. Biology is the primary science concerned with the study of life, although many other sciences are involved.
The definition of life is controversial. The current definition[according to whom?] is that organisms maintain homeostasis, are composed of cells, undergo metabolism, can grow, adapt to their environment, respond to stimuli, and reproduce. However, many other biological definitions have been proposed, and there are also some borderline cases, such as viruses. Biophysicists have also proposed some definitions, many being based on chemical systems. There are also some living systems theories, such as the Gaia hypothesis, the idea that the Earth is alive; the former first developed by James Grier Miller. Another one is that life is the property of ecological systems, and yet another is the complex systems biology, a branch or subfield of mathematical biology. Some other systemic definitions includes the theory involving the darwinian dynamic, and the operator theory. However, throughout history, there have been many other theories and definitions about life such as materialism, the belief that everything is made out of matter and that life is merely a complex form of it; hylomorphism, the belief that all things are a combination of matter and form, and the form of a living thing is its soul; spontaneous generation, the belief that life repeatedly emerge from non-life; and vitalism, a discredited scientific hypothesis that living organisms possess a "life force" or "vital
भिडियो हेर्न तलको बक्स भित्र क्लिक गर्नुहोस
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