Carbon dating dictionary

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There are eight major taxonomic levels: [domain, kingdom, phyla, class, order, [family]], genus, and species.The three-domain system of biological classification as proposed by Carl Woese and others (in 1977) classifies organisms into the following domains: archaea (archaeabacteria), bacteria (eubacteria), and eucarya (eukaryotes). Organisms may also be grouped based on their cellular composition.At elevated temperatures, carbon reacts with oxygen to form carbon oxides, and will rob oxygen from metal oxides to leave the elemental metal.This exothermic reaction is used in the iron and steel industry to smelt iron and to control the carbon content of steel: Carbon combines with some metals at high temperatures to form metallic carbides, such as the iron carbide cementite in steel, and tungsten carbide, widely used as an abrasive and for making hard tips for cutting tools.Although thermodynamically prone to oxidation, carbon resists oxidation more effectively than elements such as iron and copper that are weaker reducing agents at room temperature.Carbon is the sixth element, with a ground-state electron configuration of 1s, of which the four outer electrons are valence electrons.Carbon compounds form the basis of all known life on Earth, and the carbon-nitrogen cycle provides some of the energy produced by the Sun and other stars.

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There are eight major taxonomic levels: [domain]], kingdom, phyla, class, order, [family]], genus, and species.

The three-domain system of biological classification as proposed by Carl Woese and others (in 1977) classifies organisms into the following domains: archaea (archaeabacteria), bacteria (eubacteria), and eucarya (eukaryotes). Organisms may also be grouped based on their cellular composition.

At elevated temperatures, carbon reacts with oxygen to form carbon oxides, and will rob oxygen from metal oxides to leave the elemental metal.

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The physical properties of carbon vary widely with the allotropic form.It belongs to group 14 of periodic table Carbon is the 15th most abundant element in the Earth's crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen.Carbon's abundance, its unique diversity of organic compounds, and its unusual ability to form polymers at the temperatures commonly encountered on Earth enables this element to serve as a common element of all known life.A single-celled organism is one that consists of only one cell.In contrast, a multicellular organism is one that is comprised of more than one cell and whose cells are organized into tissues, organs, and then into systems.

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