In a population of birds in africa, it was observed that birds with small or large beaks could efficiently crack and eat small or large seeds, respectively. birds with intermediate beaks had trouble with both types of seeds. what type of selection would be expected to occur in this population if small and large seeds were the only types of food available to these birds?

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.