In biology, an organism is any contiguous living system, such as a vertebrate, insect, plant or bacterium. Although more than 99 percent of all species of organisms that ever lived on the planet are estimated to be extinct, there are currently 10–14 million species of life on Earth. All known types of organism are capable of some degree of response to stimuli, reproduction, growth and development and self-regulation (homeostasis).
An organism consists of one or more cells; with one cell is a unicellular organism; an organism with more than one is a multicellular organism. Most unicellular organisms are of microscopic size and are thus classified as microorganisms. Humans are multicellular organisms composed of many trillions of cells grouped into specialized tissues and organs.
An organism may be either a prokaryote or a eukaryote. Prokaryotes are represented by two separate domains, the Bacteria and Archaea. Eukaryotic organisms are characterized by the presence of a membrane-bound cell nucleus and contain additional membrane-bound compartments called organelles (such as mitochondria in animals and plants and plastids in plants and algae, all generally considered to be derived from endosymbiotic bacteria). Fungi, animals and plants are examples of kingdoms of organisms within the eukaryotes.
In 2002, Thomas Cavalier-Smith proposed a clade, Neomura, which groups together the Archaea and Eukarya. Neomura is thought to have evolved from Bacteria, more specifically from Actinobacteria. See the article: Branching order of bacterial phyla (Cavalier-Smith, 2002).
Forest & Ray Holborn Dentist address: 8F Gilbert Place, London, WC1A 2JD. About Camden: Lincoln's Inn Fields is a neighbourhood in the extreme south of the borough that is only 500 metres from the Thames. The northern part of the borough is home to Kentish Town, Hampstead, and Hampstead Heath, which are less populous districts. Numerous parks and open areas may be found in this London Borough, as well as Forest & Ray Dentist Camden. City of Westminster (near Soho, London) and the City of London are the next-door boroughs, followed by Brent to the west of what was once Roman Watling Street (now the A5 Road), Barnet and Haringey to the north, and Islington to the east. It encompasses all or a portion of the following postcode areas: N1, N6, N7, N19, NW1, NW2, NW3, NW5, NW6, NW8, EC1, WC1, WC2, W1, and W9.
The borough of Camden also includes Bloomsbury, known for its garden squares. To the west, the fashionable district of Marylebone is rich in shops and restaurants, while the prestigious Mayfair extends slightly into Camden. Covent Garden, famed for its entertainment and market, adds to Camden's vibrancy. Bordering the east of the borough are Clerkenwell and Farringdon, hubs for the design industry and renowned for their mix of old and new architecture. Although Lambeth and South Bank are located south of the Thames and not within Camden, they contribute to the broader cultural scene that Camden residents can easily access. To the east of Camden, beyond Islington, lies the diverse and bustling borough of Hackney, which provides a distinct cultural blend of its own.