How does one country pay another country for impirts?

What does this quotation from the introduction of thedeclaration of independence do?

The two-factor theory of emotion was proposed by

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.