Atlantis001
What is life ? How do you define life ? How can anyone tell if something is alive ?
There is a text from Wikipedia to help you define :
"It is important to note that life is a definition that applies at the level of species, so even though many individuals of any given species do not reproduce, possibly because they belong to specialised sterile castes (such as ant workers), these are still considered forms of life. One could say that the property of life is inherited; hence, sterile hybrid species such as the mule are considered life although not themselves capable of reproduction. It is also worth noting that non-reproducing individuals may still help the spread of their genes through such mechanisms as kin selection.
For similar reasons, viruses and aberrant prion proteins are often considered replicators rather than forms of life: they cannot reproduce without very specialised substrates such as host cells or proteins, respectively. However, most forms of life rely on foods produced by other species, or at least the specific chemistry of Earth's environment.
Viruses reproduce, flames grow, some software programs mutate and evolve, future software programs will probably evince (even high-order) behavior, machines move, and some form of proto-life consisting of metabolizing cells without the ability to reproduce presumably existed. Still, some would not call these entities alive. Generally, all six characteristics are required for a population to be considered a life form."
http://en.wikipedia.org/wiki/Life
There is a text from Wikipedia to help you define :
"It is important to note that life is a definition that applies at the level of species, so even though many individuals of any given species do not reproduce, possibly because they belong to specialised sterile castes (such as ant workers), these are still considered forms of life. One could say that the property of life is inherited; hence, sterile hybrid species such as the mule are considered life although not themselves capable of reproduction. It is also worth noting that non-reproducing individuals may still help the spread of their genes through such mechanisms as kin selection.
For similar reasons, viruses and aberrant prion proteins are often considered replicators rather than forms of life: they cannot reproduce without very specialised substrates such as host cells or proteins, respectively. However, most forms of life rely on foods produced by other species, or at least the specific chemistry of Earth's environment.
Viruses reproduce, flames grow, some software programs mutate and evolve, future software programs will probably evince (even high-order) behavior, machines move, and some form of proto-life consisting of metabolizing cells without the ability to reproduce presumably existed. Still, some would not call these entities alive. Generally, all six characteristics are required for a population to be considered a life form."
http://en.wikipedia.org/wiki/Life
