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  2. Kingdom (biology) - Wikipedia

    en.wikipedia.org/wiki/Kingdom_(biology)

    The hierarchy of biological classification's eight major taxonomic ranks.A domain contains one or more kingdoms. Intermediate minor rankings are not shown. In biology, a kingdom is the second highest taxonomic rank, just below domain.

  3. Matter - Wikipedia

    en.wikipedia.org/wiki/Matter

    Fully 70% of the matter density in the universe appears to be in the form of dark energy. Twenty-six percent is dark matter. Only 4% is ordinary matter. So less than 1 part in 20 is made out of matter we have observed experimentally or described in the standard model of particle physics. Of the other 96%, apart from the properties just ...

  4. Composition of matter - Wikipedia

    en.wikipedia.org/wiki/Composition_of_matter

    After extended litigation, in 2000, a Canadian court permitted issuance of a patent on a mouse as a "composition of matter." [14] However, in 2002, the Canadian Supreme Court reversed that ruling and held (5-4) that the mouse itself could not be patented, but the biochemical process used to modify it could be. [15]

  5. Gas - Wikipedia

    en.wikipedia.org/wiki/Gas

    Drifting smoke particles indicate the movement of the surrounding gas.. Gas is one of the four fundamental states of matter.The others are solid, liquid, and plasma. [1] A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).

  6. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    Baryonic matter forms about 4% of the total energy density of the observable universe, with an average density of about 0.25 particles/m 3 (mostly protons and electrons). [112] Within a galaxy such as the Milky Way, particles have a much higher concentration, with the density of matter in the interstellar medium (ISM) ranging from 10 5 to 10 9 ...

  7. Chemistry - Wikipedia

    en.wikipedia.org/wiki/Chemistry

    Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

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