4. The ability of arches to support huge amounts of weight is due to improvements in what?
A. the design of the arches only
B. the material of the arches only
C. neither the design nor the material of the arches
D. both the design and the material of the arches

Reasoning based on the ease with which we can bring something to mind involves the use of the heuristic

What new form of music swept the nation in the 1950s a. chamber music b. hip-hop c. jazz d. rock-and-roll

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.