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en.wikipedia.org/wiki/Life

It is a challenge for scientists and philosophers to define life. ... Any definition must be general enough to both encompass all known ...

www.biology-online.org/dictionary/Life

Jan 15, 2017 ... Life. Home » Life. Definition. noun, plural: lives. noun, plural: lives ... Despite of the irresolute answer for questions about life, the basic ...

www.khanacademy.org/science/biology/intro-to-biology/what-is-biology/a/what-is-life

In the intro to biology video, we defined biology as the branch of science concerned ... However, it's surprisingly hard to come up with a precise definition of life.

www.nasa.gov/vision/universe/starsgalaxies/life's_working_definition.html

Definitions tell us about the meanings of words in our language, as opposed to telling us about the nature of the world. In the case of life, scientists are interested  ...

www.britannica.com/topic/life

Sep 22, 2017 ... But this is life as a whole. More than 99.9 percent of species that have ever lived are extinct. The several branches of science that reveal the ...

www.merriam-webster.com/dictionary/life%20science

Define life science: a branch of science (such as biology, medicine, and sometimes anthropology or sociology) that deals with living organisms and…

www.dictionary.com/browse/life-science

Life science definition, any science that deals with living organisms, their life processes, and their interrelationships, as biology, medicine, or ecology. See more.

www.ncbi.nlm.nih.gov/pubmed/21162680

Astrobiology. 2010 Dec;10(10):1003-9. doi: 10.1089/ast.2010.0535. The definition of life: a brief history of an elusive scientific endeavor. Tirard S(1), Morange M, ...

www.ncbi.nlm.nih.gov/pmc/articles/PMC3005285

But the NASA definition-theory of life says: never mind. ... This is scientific pragmatism.