Organism Definition and 3 Discussions

In biology, an organism (from Greek: ὀργανισμός, organismos) is any organic living system that functions as an individual entity. All organisms are composed of cells. Organisms are classified by taxonomy into groups such as multicellular animals, plants, and fungi; or unicellular microorganisms such as protists, bacteria, and archaea. All types of organisms are capable of reproduction, growth and development, maintenance, and some degree of response to stimuli. Humans, squids, mushrooms, and vascular plants are examples of multicellular organisms that differentiate specialized tissues and organs during development.
A unicellular organism may be either a prokaryote or a eukaryote. Prokaryotes are represented by two separate domains – 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.
Estimates on the number of Earth's current species range from 2 million to 1 trillion, of which over 1.7 million have been documented. More than 99% of all species, amounting to over five billion species, that ever lived are estimated to be extinct.In 2016, a set of 355 genes from the last universal common ancestor (LUCA) of all organisms was identified.

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  1. Suyash Singh

    Gaseous living organisms

    I cannot find on google. Can you give me examples of living beings that are in the from of gas like water vapour or smoke or anything else that is a gas. Like jellyfish is made of water Humans are solid
  2. I

    Do cells migrate in a body?

    Once cells in the body "find their place" between other neighboring cells, do they stay there touching each other in the same way or do they move around, migrating, sliding around with their membranes? Can a cell just "take off"? I wonder the same about neuron cells and their axons and...
  3. I

    Is there a common name for protective layer of an organism?

    Hello, is there a common name/word/terminology for any protective layers on an organism, for example, skin on humans, bark on a tree, etc?