According to John Horn, fluid intelligence steadily declines from middle adulthood onward. Fluid intelligence is described as ability to solve problems at the moment-navigated and adapt to a new situation. According to John Horn, there is a fluid and crystallized intelligence.
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The following is the classification of each pair of variables into two categories, namely explanatory and response, based on the relation between the variables:
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(a) Whether or not a person likes to sing and whether or not a person likes to dance - Explanatory: There is no direct relation between the choices made by the person but it can be explained why he likes or does not like either of two or both.
(b) The number of pages in a textbook and the cost of a new copy of the textbook - Response: The cost of the book is dependent on the pages in it as each page bears some cost.
(c) The number of alcoholic drinks consumed and the blood alcohol content - Response: The blood alcohol content would keep increasing as long as alcohol is consumed.
(d) In a study of adolescents, the dose of vitamin D given each day for a year (50, 100, or 200 international units) and the change in total bone mineral content from the beginning of the study to the end of the study - Response: The amount of vitamin D would reflect as more in the adolescents that were administered higher dosages of vitamin D.
Nullification, in United States constitutional history, is a legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional. So the best answer among the following choices is letter C. Southern senator Calhoun and Hayne argued that Congress could not pass laws that favored one region of the country over another.
The colonists were not at all happy at the way Stamp Act was forced on them without taking their consent. The tax was being taken by the Britishers to support their wars in North America. The colonists not only debated about this tax in colonial legislature, but also distributed written documents against the act. Mob or crowd action against the tax collectors was another way of protesting against the tax. Colonists were so angry that they even tar and feather the tax collectors. This ways were all to indicate their anger towards implementation of the Stamp Act.
