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61International child abduction in Mexico — Coat of arms of Mexico Main article: International child abduction Mexico is amongst the world s most popular sources and destinations for international child abduction while also being widely regarded as having one of the least effective systems …
62Music of the United States — American music redirects here. For other uses, see American music (disambiguation). Music of United States of America Timeline General topics Education · History G …
63linguistics — /ling gwis tiks/, n. (used with a sing. v.) the science of language, including phonetics, phonology, morphology, syntax, semantics, pragmatics, and historical linguistics. [1850 55; see LINGUISTIC, ICS] * * * Study of the nature and structure of… …
64human behaviour — Introduction the potential and expressed capacity for physical, mental, and social activity during the phases of human life. Human beings, like other animal species, have a typical life course that consists of successive phases of… …
65Mesopotamia, history of — ▪ historical region, Asia Introduction history of the region in southwestern Asia where the world s earliest civilization developed. The name comes from a Greek word meaning “between rivers,” referring to the land between the Tigris and… …
66Ctenophora — For the genus of crane flies, see Ctenophora (genus). Comb jellies Temporal range: Cambrian – Recent …
67Species — In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is …
68On the Origin of Species — Origin of Species redirects here. For other uses, see Origin of Species (disambiguation). On the Origin of Species   …
69Race and genetics — Notions of race based on Human genetic variation have replaced historical approaches such as craniology with the advent of human genetics in the 20th century. Early historyBlood groupsPrior to the discovery of DNA as the hereditary material,… …
70Origin of birds — For the book by Gerhard Heilmann, see The Origin of Birds (book). The famous Berlin specimen of Archaeopteryx lithographica The origin of birds is a contentious and central topic within evolutionary biology. A close relationship between birds and …
