In the early 20th century, the anthropologist Franz Boas described changes in skull form among the children of Europeans who had emigrated to North America. He found that the reason for these changes could not be explained by genetics. His findings underscore the fact that
A. describing changes in skull form is the most accurate way to study the impact of migration on traveling populations.
B. even though the environment influences the phenotype, genetics is a more powerful determinant of racial differences.
C. observing changes over one generation is not enough to make conclusions about changes in the genotype and phenotype.
D. phenotypic similarities and differences don't necessarily have a genetic basis.
E. diet affects which genes are turned off and which get turned on, resulting in a particular phenotypic characteristic.
Answer: D
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