 They argue that Sparks and Jantz misrepresented Boas's claims and that Sparks's and Jantz's data actually support Boas.For example, they point out that Sparks and Jantz look at changes in cranial size in relation to how long an individual has been in the United States in order to test the influence of the environment.Boas, however, looked at changes in cranial size in relation to how long the mother had been in the United States.