Organism

Etymology and Historical Concept

The term organism derives from the Ancient Greek organon, denoting an instrument, tool, implement, sense organ, or apprehension.^[2][3][4] Aristotle viewed living beings as unified wholes composed of organs working to serve the functions of the whole, positing that the operation of an organism was directed by its soul.^[5][6][7] In scientific literature, the Neo-Latin term organismus emerged in the late seventeenth and early eighteenth centuries in the works of Gottfried Wilhelm Leibniz and Christian Wolff, later gaining wide currency through Carl Linnaeus, Jean-Baptiste Lamarck, and Immanuel Kant.^[8][9]

The word is directly linked to the concept of organisation.^[2][3] In his 1790 work Critique of Judgment, Immanuel Kant defined an organism as both an organised and a self-organising being.^[10][11] Ludwig von Bertalanffy later characterised living organisms within general systems theory as open systems maintaining a steady state through the continuous inflow and outflow of matter and energy, adapting to ambient conditions while preserving their integrity.^[12][13]

Criteria for Organismality

Defining what constitutes an organism has provoked persistent debate in biological theory.^[14][15] Many dictionary definitions frame an organism broadly as any living structure capable of growth and reproduction.^[16][17][18] Nonetheless, theorists have proposed more specific criteria, including autonomous metabolism, growth, and reproduction, an immune response distinguishing self from non-self, and Claude Shannon information maintenance.^[16][19][20] Erwin Schrödinger introduced the thermodynamic concept that living systems preserve order through anti-entropy, feeding upon negative entropy to maintain a low-entropy state.^[21][22][23]

Another proposed criterion is noncompartmentability, meaning a structure cannot be divided without losing its functional integrity.^[24] Richard Dawkins formulated this property as being sufficiently heterogeneous in form to become non-functional if cut in half.^[25] This criterion faces obvious counterexamples in nature: cuttings taken from plants such as basil or willow regenerate adventitious roots and develop into complete functional plants, and simple metazoans such as hydras can regenerate whole individuals from severed fragments.^[24][25][26]

Biological individuality has also been defined as the simultaneous possession of genetic uniqueness, genetic homogeneity, and physiological autonomy.^[27] However, critics point out that these attributes often vary independently.^[28][29] For instance, clonal organisms and vegetative propagules possess genetic homogeneity without possessing absolute separate genetic origins, suggesting biological individuality is multidimensional rather than an all-or-nothing threshold.^[28][30]

Autopoiesis

An alternative approach defines living systems through autopoiesis, a concept developed by Chilean biologists Humberto Maturana and Francisco Varela.^[31][32] Autopoietic systems are defined by their internal organisation rather than by a static list of functional traits.^[31] A system is autopoietic when the chemical processes and molecules produced within it generate the very network of transformations that created them, while continually regenerating and specifying the boundary of the system itself.^[31]

Under this framework, individual cells are the only primary autonomous autopoietic systems.^[31] Multicellular organisms, while displaying stable homeostatic organization and higher-order cohesion, derive their living status from the integrated autopoietic operation of the cellular units of which they are composed.^[31][32] Living beings maintain their existence only so long as their autopoietic organisation remains intact; death represents the irreversible breakdown of this organisation.^[33]

Cooperation and Conflict

Evolutionary biologists David Queller and Joan Strassmann suggest that organismality evolved socially when groups of simpler biological units, beginning with molecules and individual cells, cooperated with minimal internal conflict.^[34][35] Under their proposal, high cooperation and low conflict serve as the primary defining traits of an organism.^[34] This perspective accommodates entities spanning different taxonomic domains, such as the lichen symbiosis between fungi and algae or cyanobacteria, or the lifelong obligate fusion between male and female anglerfish, treating them as coherent organismal units.^[34]

Samuel Diaz-Munoz and colleagues expanded on this model, arguing that organismality can be measured across a continuum of cooperation and conflict over evolutionary time.^[36] In their framework, organismality is context-dependent, and lineages can transit through partially integrated stages before reaching stable, highly unified organismal organization.^[36][37] When selection operates at the level of the collective, groups can evolve into superorganisms through group adaptation.^[38][39]

Chemical Composition

Living organisms are complex physical systems governed by the universal laws of chemistry and thermodynamics.^[22][40] Approximately sixty chemical elements occur within living matter, representing almost all stable, non-noble elements on Earth. These bioelements are broadly grouped into primary and secondary categories. The primary bioelements, often abbreviated as CHNOPS, comprise carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur, which together account for roughly 95 to 96.2 percent of living biomass.^[41]

No organism has yet been found that can do without magnesium and zinc, while for all other elements besides these and carbon, hydrogen, oxygen, nitrogen, phosphorus and sulfur, including some that certain organisms need in larger amounts, it is not established whether the need is essential.^[42] Carbon forms the primary structural foundation of organic life due to its small atomic radius and its ability to form four stable covalent bonds, facilitating the synthesis of three-atom molecules like carbon dioxide as well as linear and branched macromolecules consisting of thousands of atoms.^[43] Silicon-based alternatives, while chemically related, form silicon-oxygen bonds that are too rigid and indestructible under normal physiological conditions to permit metabolic turnover.

Water is the most abundant compound in living cells, typically constituting between 70 and 80 percent of an organism's total mass.^[44] Water serves as the universal solvent in which cellular metabolic reactions occur, provides turgor pressure in plant cells, participates directly in hydrolysis and photosynthesis, and mediates thermoregulation through its high heat capacity and latent heat of vaporisation.^[45]

Biological Macromolecules

Approximately 90 percent of living matter is constructed from roughly forty fundamental monomeric organic molecules, which are universal across all domains of life.^[46] These monomers assemble into four major classes of biological macromolecules: nucleic acids, proteins, carbohydrates, and lipids.^[46] Nucleic acids, consisting of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), store and transmit genetic information as sequences of four nucleotide bases: adenine, cytosine, guanine, and thymine (or uracil in RNA).^[46] Sequences are grouped into triplet codons, each specifying a single amino acid.

Proteins are polymers composed of twenty standard amino acids that fold into specific three-dimensional conformations to perform distinct physiological tasks.^[46] Protein classes include enzymes that catalyse metabolic transformations, structural scaffolds such as tubulin and collagen, regulatory molecules including transcription factors and cyclins, signalling hormones and receptors, and defensive agents such as antibodies or animal toxins. In some organisms, toxins incorporate non-proteinogenic amino acids such as canavanine.

Carbohydrates function as readily mobilised metabolic fuels and structural materials.^[47] Glucose stands at the start of glycolysis, one of the most primitive metabolic pathways, and starch and glycogen store energy in some organisms.^[47] In structural roles, carbohydrates form rigid extracellular walls, notably cellulose in plants and chitin in fungal cell walls and arthropod exoskeletons.^[47] Lipids, particularly phospholipids, self-assemble into fluid bilayers that form cell membranes, establishing selectively permeable barriers that regulate chemical gradients and maintain transmembrane electrical potentials.^[48]

Cellular Structure and Classification

Cell theory, established in 1839 by Matthias Schleiden and Theodor Schwann, postulates that all organisms are composed of one or more cells, that the cell is the elementary unit of life, and that all cells arise from pre-existing cells.^[49][50][51] Regardless of complexity, all cells feature a plasma membrane consisting of a lipid bilayer studded with proteins, a saline cytoplasm containing metabolic machinery, and nucleic acids carrying the instructions for protein synthesis carried out by ribosomes.^[49]

Organisms are categorized into two fundamental cellular architectures: prokaryotes and eukaryotes.^[52][53] Prokaryotes, comprising the domains Bacteria and Archaea, are unicellular organisms that lack a membrane-bound nucleus and endomembrane organelles; their circular DNA resides in an unenclosed nucleoid region.^[52][54] Eukaryotes contain a membrane-enclosed nucleus packaging linear chromosomes with histone proteins, along with specialized membrane-bound organelles such as mitochondria and plastids.^[52][53][55] Eukaryotic organelles originated through endosymbiogenesis with proteobacteria and cyanobacteria.^[53][55]

Intermediate and divergent cellular forms have also been identified. Dinoflagellates possess a cellular architecture termed the mesokaryote, characterised by a distinct nuclear envelope enclosing permanently condensed chromosomes that lack typical eukaryotic histones and nucleosomes. In 2012, researchers documented Parakaryon myojinensis, an unusual deep-sea microorganism possessing a nuclear envelope but lacking eukaryotic endomembrane organelles, with genetic material held in filamentous structures and a peptidoglycan-like cell wall, leading some researchers to propose a separate domain, Parakaryota.^[56][57][58]

Tissues, Organs, and Systems

Unicellular organisms execute all necessary life activities within a single cell, using specialized organelles like flagella or cilia for locomotion and sensation.^[59][60] In multicellular organisms, cells differentiate during development to undertake specific tasks.^[60][61][62] Groups of similar specialized cells form tissues.^[60] Animals possess four basic tissue classes: epithelial, connective, muscle, and nervous tissue. Plants possess three fundamental tissue systems: dermal, ground, and vascular tissue.

Tissues integrate to form organs, which carry out specialised physiological operations, such as the heart pumping blood or the skin acting as an environmental barrier.^[60][61][62] Organs in turn cooperate as organ systems, including the circulatory, digestive, respiratory, excretory, nervous, endocrine, and reproductive systems.^[61] In complex multicellular organisms, these systems are coordinated by neurohumoral mechanisms, including autonomic nervous impulses and endocrine secretions, to maintain functional integration.

Body Symmetry

Multicellular organisms exhibit distinct geometrical arrangements of anatomical structures relative to body axes. Organisms lacking a definite geometric plane of symmetry, such as amoebae and many sponges, are termed asymmetrical. Radial symmetry occurs in organisms structured like a cylinder or wheel, where body parts radiate from a central point, as seen in echinoderms and cnidarians. Bilateral symmetry, found in the vast majority of animals including vertebrates and arthropods, involves a single sagittal plane dividing the organism into approximately mirror-image left and right halves.

Metabolism and Energy

Metabolism comprises the complete set of chemical reactions occurring within an organism that sustain life, process nutrients, and produce cellular components.^[49][63] It is split into catabolic pathways, which break down complex organic compounds to release chemical energy, and anabolic pathways, which consume energy to synthesize cellular structures, macromolecules, and cellular reserves.^[22] In the majority of cellular organisms, adenosine triphosphate (ATP) functions as the universal energy currency, shuttling chemical potential energy between catabolic and anabolic pathways.^[22]

Organisms acquire energy through distinct trophic strategies. Autotrophs generate usable organic compounds from inorganic carbon substrates.^[64] Photoautotrophs, including green plants, algae, and cyanobacteria, harness solar radiation to drive carbon fixation.^[64][65] Chemoautotrophs, primarily bacteria and archaea, extract chemical energy through the oxidation of inorganic substances such as hydrogen sulfide, elemental sulfur, ferrous iron, or molecular hydrogen, sustaining ecosystems in light-deprived environments such as deep-sea hydrothermal vents.^[64][66] Heterotrophs depend on ingesting pre-existing organic compounds manufactured by other organisms, acting as consumers, parasites, or saprophytic decomposers.

Cellular respiration provides the metabolic mechanism to release energy from organic substrates.^[22][49] Aerobic organisms rely strictly on molecular oxygen as the terminal electron acceptor in the electron transport chain. Anaerobic organisms use alternative inorganic electron acceptors such as nitrate, sulfate, or carbon dioxide, or rely on fermentation pathways.^[67] Facultative anaerobes, such as brewer's yeast, switch between aerobic respiration and fermentation depending on oxygen availability.

Homeostasis and Thermodynamics

Organisms operate as open thermodynamic systems far from thermodynamic equilibrium.^[22][68] They maintain a highly organized internal environment of low local entropy by importing energy and matter from their surroundings and exporting degraded energy as heat and metabolic waste products.^[22][68][69] This continuous throughput obeys the second law of thermodynamics, as the decrease in internal entropy within the organism is compensated by a corresponding increase in the total entropy of the surrounding universe.^[22][69]

Homeostasis is the maintenance of the physical and chemical balance between an organism's internal environment and the external environment.^[22][70] Homeostatic control systems rely on negative feedback loops, where deviations from a physiological set point trigger corrective responses, such as thermoregulation, osmotic regulation of electrolytes, and stabilization of blood pH via bicarbonate buffers. In contrast, positive feedback mechanisms amplify initial departures to drive processes to completion, as observed in specific developmental stages and physiological cascades.

Responsiveness and Communication

Irritability, the capacity to perceive external and internal stimuli and execute adaptive responses, is a universal characteristic of life.^[60][61][62] Stimuli include fluctuations in light intensity, temperature, chemical concentration, gravity, and tactile contact.^[49][71] Plants exhibit directed growth movements termed tropisms, such as phototropism toward sunlight or gravitropism in roots, as well as non-directional nastic movements, such as the rapid leaf folding of Mimosa pudica upon touch.^[72] Animals deploy specialized nervous systems, sensory organs, and endocrine pathways to coordinate motor, behavioural, and physiological adjustments.^[71]

In multicellular organisms, cells are often specialised and communicate with one another.^[59] A colonial organism such as a siphonophore functions as an individual but is composed of communicating individuals..^[25]

Growth, Development, and Life Span

Growth involves an increase in physical dimensions and dry biomass, driven by biosynthetic assimilation and cell proliferation.^[72][73] Development encompasses qualitative, orderly structural transformations across an individual's life history (ontogeny), progressing from an initial cell, spore, or zygote to an adult reproductive form.^[71] Physical constraints govern organism size: in unicellular organisms, the geometric decrease in the surface-area-to-volume ratio limits nutrient intake by simple diffusion as cell radius expands, placing an upper boundary on single-cell volume.^[74] In terrestrial multicellular organisms, overall skeletal load-bearing capacities set mechanical limits on body mass.^[75]

Life span varies by orders of magnitude among species.^[76] Some insects survive as adults for only a single day, and Escherichia coli has a generation time of twenty minutes under favourable conditions.^[76] Long-lived plants, such as giant sequoias and bristlecone pines, survive for thousands of years.^[76] Cellular senescence is tightly linked to the gradual shortening of telomeres, protective repetitive DNA caps at chromosome ends.^[77] When telomere length degrades below critical levels, cells undergo programmed cell death (apoptosis).^[77] However, the hydrozoan Turritopsis dohrnii is one of the organisms currently known to have no life span limit.

Massive organisms can achieve extensive physical scales. The humongous fungus (Armillaria ostoyae) in the Malheur National Forest in Oregon covers an area of nearly 9 square kilometres (roughly 880 to 965 hectares), with its age estimated between 1,900 and 8,650 years.^[78][79] The heaviest known clonal organism is Pando, a quaking aspen clone (Populus tremuloides) in Utah weighing over 6,600 tonnes and estimated to be 80,000 years old.^[80][81] Among non-clonal individual organisms, the General Sherman giant sequoia in California has a stem wood volume of 1,486 cubic metres and an estimated dry mass of 1,950 tonnes.^[82] Marine mammals include the blue whale, the heaviest known animal species, reaching nearly 200 tonnes.^[83]

Reproduction and Inheritance

Reproduction generates new individuals and transmits hereditary instructions across generations.^[49] Asexual reproduction produces offspring from a single parent without gametic fusion, utilizing binary fission, budding, fragmentation, spore formation, or vegetative propagation.^[49]

Sexual reproduction involves the recombination of genetic material from two gametes produced through meiosis, generating diverse genomic configurations.^[84] Core genes governing meiotic machinery have been identified across early-diverging eukaryotic lineages, suggesting that sexual reproduction was likely present in the last eukaryotic common ancestor.^[85][86] In prokaryotes, primitive parasexual genetic exchange occurs through natural bacterial transformation, conjugation, and bacteriophage transduction.^[87][88] Natural transformation is an active adaptation, relying on dedicated macromolecular complexes to bind exogenous DNA and integrate it into the host chromosome via homologous recombination.^[87][88]

Evolutionary History and Common Descent

The theory of universal common descent holds that all known cellular life on Earth descended from a single ancestral gene pool.^[63][89][90] All living cells employ nucleic acids for hereditary storage, synthesize proteins using the same twenty canonical amino acids, utilize a near-universal genetic code, and maintain shared metabolic pathways.^[91][92] The universality of these arbitary biochemical conventions provides robust evidence against the independent abiogenic origin of separate modern lineages.^[91][93]

The RNA world hypothesis postulates an early stage of life where self-replicating ribonucleic acid molecules preceded the evolutionary development of DNA and enzymatic proteins.^[94][95][96] According to this model, self-replicating RNA strands initiated Darwinian natural selection through heritability, phenotypic variation, and differential replication rate.^[94][95][97] RNA molecules called ribozymes functioned both as information storage and as catalysts for primitive peptide bonds, culminating in the evolution of the ancestral ribosome.^[96][98][99] Spontaneously assembling phospholipid vesicles subsequently encapsulated these prebiotic replicators into protocells.^[100][101]

Early geological traces of life have been identified in ancient sedimentary formations. Putative biogenic graphite in metasedimentary rocks in Western Greenland dates to approximately 3.7 billion years ago.^{[102][103][104]} Fossil microbial mats and stromatolites preserved in sandstone in Western Australia date to 3.48 billion years ago.^{[89][104][105]} Filamentous hematite tubes found in Quebec, Canada, have been interpreted as hydrothermal vent microfossils dating from 3.77 to 4.28 billion years ago, suggesting that life may have arisen during the Hadean eon.^{[106][107][108]} Around 2.4 to 2.1 billion years ago, the metabolic activity of photosynthetic cyanobacteria released molecular oxygen into the atmosphere during the Great Oxidation Event, altering the chemical composition of the oceans and atmosphere and precipitating banded iron formations.^[109][110]

Last Universal Common Ancestor

The last universal common ancestor (LUCA) is the most recent shared ancestor from which all extant cellular life on Earth descends.^{[89][90][111]} Molecular clock estimates date LUCA to the Paleoarchean era, approximately 3.5 to 3.8 billion years ago.^{[89][112][113]} Genomic reconstructions by William F. Martin and colleagues in 2016 analyzed 6.1 million prokaryotic protein-coding genes and identified 355 protein clusters likely present in LUCA's genome.^{[67][114][115]}

LUCA was inferred to be an anaerobic, thermophilic organism inhabiting geochemically active hydrothermal vents enriched in hydrogen, carbon dioxide, and iron.^{[67][114][115]} LUCA fixed carbon dioxide through the Wood-Ljungdahl (reductive acetyl-CoA) pathway, fixed molecular nitrogen, and relied on iron-sulfur clusters and radical reaction mechanisms.^{[67][114][115]} Its enzymatic cofactors revealed dependencies on transition metals, flavins, S-adenosylmethionine, coenzyme A, ferredoxin, and molybdopterin.^{[67][114][115]} This reconstruction has drawn criticism from researchers who argue that several identified genes may reflect subsequent horizontal gene transfer between archaea and bacteria rather than primordial retention.^[116][117]

Taxonomy and Tree of Life

Biological classification groups organisms hierarchically based on evolutionary relatedness. The classical system initiated by Carl Linnaeus in 1735 recognized two kingdoms of life, Plantae and Animalia.^[118][119] Over the nineteenth and twentieth centuries, alternative schemes expanded to five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.^{[120][121][122]} In 1990, Carl Woese introduced the three-domain system based on ribosomal RNA sequence divergences, dividing cellular life into Bacteria, Archaea, and Eukaryota.^[123][124]

Extensive horizontal gene transfer (HGT) across phylogenetic boundaries, especially among prokaryotes, has complicated simple bifurcating models of the tree of life.^[125] Biologist Peter Gogarten suggested that a web or reticulated mosaic provides a more accurate metaphor than a tree to describe the evolutionary history of microbial genomes.^[125] Furthermore, recent findings support that eukaryotes derive from archaea, specifically the phylum Promethearchaeota, with archaea of the class Heimdallarchaeia as their closest relatives, through the incorporation of a bacterium by endosymbiosis..^{[124][126][127]}

Biomass and Extinction

A comprehensive assessment of global biomass by Yinon Bar-On and colleagues estimated the total carbon content of all living organisms at approximately 550 gigatonnes of carbon.^[128] Plants dominate global biomass, representing approximately 450 gigatonnes of carbon, situated primarily in terrestrial biomes.^[128] Bacteria represent approximately 70 gigatonnes and archaea approximately 7 gigatonnes, concentrated largely in the deep subsurface.^[128] Animals constitute roughly 2 gigatonnes of carbon, predominantly in marine habitats.^[128] Subsurface microorganisms are estimated to account for roughly 30 percent of Earth's total living biomass.^[64][66]

More than 99 percent of all species that have ever lived on Earth, numbering over five billion species, are estimated to be extinct.^[129][130] Contemporary rates of vertebrate extinction are estimated to exceed natural background rates by roughly one hundred times, leading biologists to characterize modern biodiversity losses as an ongoing sixth mass extinction.^[131]

Boundary Cases and Non-Standard Forms

Certain biological entities challenge standard definitions of organismality. Viruses contain nucleic acid genomes encased in a protein capsid, and they evolve through mutation and natural selection.^[16][132] However, viruses lack an autonomous metabolism, cannot synthesize organic molecules independently, and rely entirely on host cells for replication, leading many biologists to exclude them from the category of living organisms.^{[16][132][133]} Conversely, virologists proposing the virocell concept argue that the intracellular replicating state constitutes the true metabolic organism, while the free virion is merely a dormant dispersal stage analogous to a spore.^{[20][134][135]}

Subviral agents present even simpler configurations. Viroids consist solely of short, naked, circular, single-stranded RNA molecules that infect plants without encoding proteins, while prions are infectious, misfolded proteins capable of inducing conformational changes in homologous proteins in the host.^[136] Neither viroids nor prions possess cellular structure or metabolic machinery.^[136]

Colonial hydrozoans such as siphonophores occupy an ambiguous boundary between integrated organisms and colonies.^[25][26] In a siphonophore colony, genetically identical zooids are physically joined and functionally differentiated into specialized components: swimming nectophores pump water, pneumatophores regulate buoyancy, gastrozooids digest captured prey, and gonophores carry out reproduction.^[25][26] While these zooids correspond anatomically to individual organisms, the colony functions physiologically and behaviorally as a single unified individual.^[25][26]

Advances in biotechnology and synthetic biology are creating novel synthetic organisms.^[137][138] In 2008, the J. Craig Venter Institute synthesized a complete bacterial genome of Mycoplasma genitalium by assembling 25 overlapping DNA fragments in yeast, producing a functional synthetic chromosome.^[139][140] Bioengineers also construct biological chimaeras combining cells from multiple species, cyborg insects with electromechanical prostheses, and hybrots combining neural tissue with robotic controllers.^{[137][138][141]} These engineered organisms exhibit teleonomic, goal-directed behaviors that allow them to self-correct during the execution of designated functions.^{[137][138][141]}

Ecological Interactions

Organisms exist as interdependent components of ecosystems, continually influencing and being influenced by both abiotic factors and biotic communities.^[40] Relationships between organisms include parasitism, symbiosis, animals eating plants, predation and pollination..^[142] In mutualism, organisms of different species each provide some of the other's needs, as in a lichen, where the fungus provides structure and absorbs water and minerals while the alga photosynthesises..^[34] Examples include mycorrhizal associations between fungi and plant roots, hermatypic corals hosting photosynthetic zooxanthellae, and complex gut microbiota that digest cellulose and synthesize micronutrients in ruminants and humans.^[142]

Commensalism describes relationships in which one organism benefits while the other is unaffected. In contrast, antagonistic interactions encompass predation, where a predator attacks and consumes prey, and parasitism, where a parasite exploits resources from a host, imposing metabolic, reproductive, or survival costs.^[143] Organisms also engage in competition for limited resources such as nutrients, territory, or light.^[144] Antibiosis, a term coined by Selman Waksman in 1942, describes the chemical antagonism where one species inhibits or kills another by secreting toxic metabolites such as bacteriocins or antibiotics, as observed between lactic acid bacteria and putrefactive microbes.^[145]

Life actively shapes the chemical and physical environment of Earth on a planetary scale.^[63][65] Through the biogeochemical cycling of carbon, nitrogen, phosphorus, sulfur, and water, organisms transform the lithosphere, hydrosphere, and atmosphere.^[63][65] Cyanobacterial oxygenation historically created the ozone layer, which blocked ultraviolet radiation and permitted the terrestrial colonization of land.^[146] James Lovelock's Gaia hypothesis formalised this planetary feedback, proposing that the totality of living organisms interacts with the physical Earth to maintain global environmental conditions suitable for life.^[147]

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