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  2. Biological roles of the elements - Wikipedia

    en.wikipedia.org/wiki/Biological_roles_of_the...

    A large fraction of the chemical elements that occur naturally on the Earth's surface are essential to the structure and metabolism of living things. Four of these elements (hydrogen, carbon, nitrogen, and oxygen) are essential to every living thing and collectively make up 99% of the mass of protoplasm. [1]

  3. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    All living things contain two types of large molecule, proteins and nucleic acids, the latter usually both DNA and RNA: these carry the information needed by each species, including the instructions to make each type of protein. The proteins, in turn, serve as the machinery which carries out the many chemical processes of life.

  4. Living systems - Wikipedia

    en.wikipedia.org/wiki/Living_systems

    A presentation on information flow in living systems. Living systems are life forms (or, more colloquially known as living things) treated as a system. They are said to be open self-organizing and said to interact with their environment. These systems are maintained by flows of information, energy and matter. Multiple theories of living systems ...

  5. Living Things - Wikipedia

    en.wikipedia.org/wiki/Living_Things

    Living Things may refer to: Life, all objects that have self-sustaining processes (biology) Organisms, contiguous living systems (such as animals, plants, fungi, or micro-organisms) Living Things (band), an American alternative rock band; Living Things (Matthew Sweet album), 2004; Living Things (Linkin Park album), 2012

  6. List of life sciences - Wikipedia

    en.wikipedia.org/wiki/List_of_life_sciences

    This science is one of the two major branches of natural science, the other being physical science, which is concerned with non-living matter. Biology is the overall natural science that studies life, with the other life sciences as its sub-disciplines. Some life sciences focus on a specific type of organism.

  7. Natural environment - Wikipedia

    en.wikipedia.org/wiki/Natural_environment

    An ecosystem (also called an environment) is a natural unit consisting of all plants, animals, and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical factors of the environment. [34]

  8. 10 Animal Sanctuaries That are Doing Amazing Work - AOL

    www.aol.com/10-animal-sanctuaries-doing-amazing...

    More than 1,500 animal sanctuaries operate throughout the U.S., each providing its inhabitants with unique, individualized care and a forever home. Most animals that enter sanctuaries have ...

  9. Abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Abiogenesis

    The prevailing scientific hypothesis is that the transition from non-living to living entities on Earth was not a single event, but a process of increasing complexity involving the formation of a habitable planet, the prebiotic synthesis of organic molecules, molecular self-replication, self-assembly, autocatalysis, and the emergence of cell ...

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