Based on the results of cross-sectional intelligence testing, <u>younger </u><u>generations were considered to be</u><u> smarter</u><u> than older ones fo</u>r the first half of the twentieth century.
According to the research, it should be noted that intelligence increases in childhood. It then peaks in adolescence then it gradually decreases as one grows older.
The article further stated that younger people are smarter than older ones. Therefore, younger generations were considered to be smarter than older ones for the first half of the twentieth century.
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Number 6 is D
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