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The definition of life has long been a challenge for scientists and philosophers. [ 2 ] [ 3 ] [ 4 ] This is partially because life is a process, not a substance. [ 5 ] [ 6 ] [ 7 ] This is complicated by a lack of knowledge of the characteristics of living entities, if any, that may have developed outside Earth.
Earth system science – Scientific study of the Earth's spheres and their natural integrated systems; Extraterrestrial life – Life that does not originate on Earth; Information metabolism – Psychological theory of interaction between biological organisms and their environment; Organism – Individual living life form
Life is a British nature documentary series created and produced as a co-production between the BBC Natural History Unit, Discovery Channel and Skai tv in association with The Open University. It was first broadcast as part of the BBC's Darwin Season [ 1 ] on BBC One and BBC HD from October to December 2009 and was written and narrated by David ...
A nature documentary or wildlife documentary is a genre of documentary film or series about animals, plants, or other non-human living creatures. Nature documentaries usually concentrate on video taken in the subject's natural habitat , but often including footage of trained and captive animals, too.
Biologists can study life at multiple levels of organization, [1] from the molecular biology of a cell to the anatomy and physiology of plants and animals, and the evolution of populations. [1] [6] Hence, there are multiple subdisciplines within biology, each defined by the nature of their research questions and the tools that they use.
Scientists have debated the definition of life for decades, but they still lack a consensus on the answer. Skip to main content. News. 24/7 help. For premium support please call: 800 ...
Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science. These branches of natural science may be further divided into more specialized branches (also known as fields).
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