Franz Boas's famous biological studies of European immigrants to the United States revealed and measured phenotypical plasticity,showing that the environment and cultural forces could change human biology.

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This statement is true. Franz Boas's research, which he published in the early 20th century, challenged the then-prevalent view that physical characteristics such as head size, skin color, and facial features, were reliable markers of intelligence and culture. Boas demonstrated that factors such as diet, lifestyle, and socialization could influence the physical appearance of immigrants over time. This finding contributed to the modern understanding that human biology is not fixed, but can be shaped by a complex interaction between genes and the environment.

Franz Boas's Famous Biological Studies of European Immigrants to the United