Examlex
Which of the following most accurately describes population trends in the United States during the latter half of the 20th century?
Longitudinal Studies
Research studies that follow subjects over a long period of time to observe changes or developments in specific variables.
Intelligence
A complex trait that encompasses the ability to learn, understand, reason, make decisions, and adapt to new situations.
Fluid Intelligence
Those types of basic intelligence that make learning of all sorts quick and thorough. Abilities such as short-term memory, abstract thought, and speed of thinking are all usually considered part of fluid intelligence.
Age
The amount of time someone has existed or something has been in existence, often used to denote maturity, life stages, or periods of history.
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