What is a scientifically valid concern regarding adolescents' media use?

When employing the core learning system, reading text books and attending class are important ways to knowledge.

Which of the following studies is linked most directly to the establishment of the national research act in 1974 and ultimately to the belmont report and federal regulations for human subject protection? a. the public health service tuskegee study of untreated syphilis in the negro male. b. stanford prison experiment (zimbardo).c. tearoom trade study (humphreys).d. the harvard t3 study.

How have people adapted physically to different environments? why do you think these differences developed?