Organism
In Ancient Greek órganon 'instrument, implement, tool', and -ismós is any organic, living system that functions as an individual entity. all organisms are composed of cells cell theory. Organisms are classified by taxonomy into groups such(a) as multicellular animals, plants, together with fungi; or unicellular microorganisms such(a) as protists, bacteria, and archaea. All generation of organisms are capable of reproduction, growth and development, maintenance, and some measure of response to stimuli. Beetles, squids, tetrapods, mushrooms, and vascular plants are examples of multicellular organisms that differentiate specialized tissues and organs during development.
A 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(a) 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 relieve oneself 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 types of 355 genes from the last universal common ancestor LUCA of all organisms was identified.