Which is the simplest level of life's hierarchy?

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.

In ancient egypt, the pharaoh collected from the peasant farmers. a. oil b. gold c. lumber d. taxes

The platt amendment was a treaty that allowed the united states to build military bases in which country?