Answer :
All of the given answers, By studying traits in immigrants, Boas showed that racial types were not static and differed across different environments, traits in both parents and their children.
Despite sharing the same DNA, identical twins are not exactly same. Each twin is unique in terms of personality, skills, and likes and dislikes. Even now, a number of disorders, such as cancer, diabetes, autism, and schizophrenia, can affect one twin but not the other. Identical twins' variances are all caused by extrinsic causes rather than variations in their DNA.
Twin studies are frequently used by scientists to better understand how attributes are influenced by both the environment and genes. They contrast the traits of fraternal twins, who share half of their DNA with each other like siblings, and identical twins, who have the same DNA. If identical twin pairs exhibit a trait more frequently than fraternal twin pairs, it is likely to have an inherited component.
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