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The Denver Developmental Screening Test (DDST) was introduced in 1967 to identify young children, up to age six, with developmental problems. A revised version, Denver II, was released in 1992 to provide needed improvements. These screening tests provide information about a range of ages during which normally developing children acquire certain ...
Tinbergen's four questions. Tinbergen's four questions, named after 20th century biologist Nikolaas Tinbergen, are complementary categories of explanations for animal behaviour. These are also commonly referred to as levels of analysis. [1] It suggests that an integrative understanding of behaviour must include ultimate (evolutionary ...
The history of the United States from 1917 to 1945 was marked by World War I, the interwar period, the Great Depression, and World War II. The United States tried and failed to broker a peace settlement for World War I, then entered the war after Germany launched a submarine campaign against U.S. merchant ships that were supplying Germany's ...
The history of scientific thought about the formation and evolution of the Solar System began with the Copernican Revolution. The first recorded use of the term "Solar System" dates from 1704. [1][2] Since the seventeenth century, philosophers and scientists have been forming hypotheses concerning the origins of our Solar System and the Moon ...
In the eukaryotic fossil record, sexual reproduction first appeared about 2.0 billion years ago in the Proterozoic Eon, [63] [64] although a later date, 1.2 billion years ago, has also been presented. [65] [66] Nonetheless, all sexually reproducing eukaryotic organisms likely derive from a single-celled common ancestor.
Researchers haven’t identified a single cause as to why puberty is shifting earlier. There are some theories—including obesity, shifting diets, and exposure to phthalates (a substance added to ...
Quizlet is a multi-national American company that provides tools for studying and learning. [1] Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic ...
Processual archaeology (formerly, the New Archaeology) is a form of archaeological theory. It had its beginnings in 1958 with the work of Gordon Willey and Philip Phillips, Method and Theory in American Archaeology, in which the pair stated that "American archaeology is anthropology, or it is nothing" (Willey and Phillips, 1958:2), a rephrasing ...