Research on trends in average height during the twentieth century shows that height in the Western European population has increased gradually overall.However,there were periods of population decline,such as during World War I and World War II,when food was scarce.These data suggest that

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The research suggests that nutrition can affect height development, as periods of food scarcity resulted in a decline in population height. There is no evidence provided to support any of the other answer choices.

Research on Trends in Average Height During the Twentieth Century