Aperson that studies and analyzes the human past and produces a secondary source

How did german physicist werner heisenberg's uncertainty principle shake beliefs in newtonian physics?

What did president johnson risk violating the tenure of office act to the fire of his secretary of war

Which of the following accurately describes the workforces of the united states and canada? a. most of the workforce in the united states and canada is employed in the service industry. b. most of the workforce in the united states and canada is employed in the educational field. c. most of the workforce in the united states and canada is employed in manufacturing and mining. d. most of the workforce in the united states and canada is employed in agriculture.