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Subspecies is abbreviated as subsp. or ssp. and the singular and plural forms are the same ("the subspecies is" or "the subspecies are"). In zoology , under the International Code of Zoological Nomenclature , the subspecies is the only taxonomic rank below that of species that can receive a name.
Variety is defined in the code as follows: "Variety (varietas) the category in the botanical nomenclatural hierarchy between species and form (forma)". The code acknowledges the other usage as follows: "term used in some national and international legislation for a clearly distinguishable taxon below the rank of species; generally, in ...
Differences between these two groups is attributed to phenotypic plasticity and are too few for them to be termed as wholly different species. [7] Emergence of variants of the same species may occur in the same geographical region where different habitats provide distinct ecological niches for these organisms examples of these habitats include ...
These differences arise because there are few available ranks and many branching points in the fossil record. Within species further units may be recognised. Animals may be classified into subspecies (for example, Homo sapiens sapiens , modern humans) or morphs (for example Corvus corax varius morpha leucophaeus , the pied raven).
Ecosystem diversity addresses the combined characteristics of biotic properties which are living organisms (biodiversity) and abiotic properties such as nonliving things like water or soil (geodiversity). It is a variation in the ecosystems found in a region or the variation in ecosystems over the whole planet.
In the nomenclature codes of zoology and bacteriology, no taxonomic ranks are defined at the level between subgenus and species, [13] [14] but the botanical code defines four ranks below subgenus (section, subsection, series, and subseries). [15] Different informal taxonomic solutions have been used to indicate a species complex. Cryptic species
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The tree of life or universal tree of life is a metaphor, conceptual model, and research tool used to explore the evolution of life and describe the relationships between organisms, both living and extinct, as described in a famous passage in Charles Darwin's On the Origin of Species (1859). [1]