explain+previously
61Race (classification of humans) — Race Classification Race (classification of humans) Genetics …
62ethics — /eth iks/, n.pl. 1. (used with a sing. or pl. v.) a system of moral principles: the ethics of a culture. 2. the rules of conduct recognized in respect to a particular class of human actions or a particular group, culture, etc.: medical ethics;… …
63physical science — physical scientist. 1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and astronomy. 2. these sciences collectively. [1835 45] * * * Introduction the systematic study of the inorganic world …
64Ecology — For other uses, see Ecology (disambiguation). Ecology …
65Beat the Clock — For the Sparks song, see Beat the Clock (Sparks song). Beat the Clock Genre Game show Presented by Bud Collyer (1950–1961) Jack Narz (1969–1972) …
66Enron scandal — The Enron scandal was a financial scandal involving Enron Corporation Former (NYSE ticker symbol: ENE) and its accounting firm Arthur Andersen, that was revealed in late 2001. After a series of revelations involving irregular accounting… …
67colonialism, Western — ▪ politics Introduction a political economic phenomenon whereby various European nations explored, conquered, settled, and exploited large areas of the world. The age of modern colonialism began about 1500, following the European… …
68international trade — Introduction economic transactions that are made between countries. Among the items commonly traded are consumer goods, such as television sets and clothing; capital goods, such as machinery; and raw materials and food. Other transactions… …
69pre-Columbian civilizations — Introduction the aboriginal American Indian (Mesoamerican Indian) cultures that evolved in Meso America (part of Mexico and Central America) and the Andean region (western South America) prior to Spanish exploration and conquest in the 16th …
70Quaternary extinction event — Late Pleistocene landscape of northern Eurasia The Quaternary period saw the extinctions of numerous predominantly larger, especially megafaunal, species, many of which occurred during the transition from the Pleistocene to the Holocene epoch.… …
