what is life define life 25 lines
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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 plants , animals , fungi , protists ,
archaea, and bacteria . The criteria can at times be ambiguous and may or may not define
viruses , viroids , or potential synthetic life as "living". Biology is the science concerned with the study of life.
The definition of life is controversial. The current definition is that organisms are open systems that maintain homeostasis , are composed of cells , have a life cycle, undergo
metabolism , can grow, adapt to their environment, respond to stimuli , reproduce and
evolve. However, several other biological definitions have been proposed, and there are some borderline cases of life, such as viruses or viroids. In the past, there have been many attempts to define what is meant by "life" through obsolete concepts such as odic force ,
hylomorphism , spontaneous generation and
vitalism , that have now been disproved by
biological discoveries. Abiogenesis describes the natural process of life arising from non-living matter, such as simple organic compounds . Properties common to all organisms include the need for certain core
chemical elements to sustain biochemical functions.
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 plants , animals , fungi , protists ,
archaea, and bacteria . The criteria can at times be ambiguous and may or may not define
viruses , viroids , or potential synthetic life as "living". Biology is the science concerned with the study of life.
The definition of life is controversial. The current definition is that organisms are open systems that maintain homeostasis , are composed of cells , have a life cycle, undergo
metabolism , can grow, adapt to their environment, respond to stimuli , reproduce and
evolve. However, several other biological definitions have been proposed, and there are some borderline cases of life, such as viruses or viroids. In the past, there have been many attempts to define what is meant by "life" through obsolete concepts such as odic force ,
hylomorphism , spontaneous generation and
vitalism , that have now been disproved by
biological discoveries. Abiogenesis describes the natural process of life arising from non-living matter, such as simple organic compounds . Properties common to all organisms include the need for certain core
chemical elements to sustain biochemical functions.
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