What were the benefits of using locomotives to transport people and goods over horsepower?

What is the relationship between surface winds in the northern and southern hemisphere?

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.

Which choice best describes the general trend for the countries shown, for the period 2008 - 2010?