Which of the following was not an advancement created during the Han dynasty? A. the design of new water clocks and sun dials
B. the invention of paper
C. the creation of a new kind of seismograph
D. the creation of China's first system of writing

What was the result of president taft's "dollar diplomacy

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a. static group comparisonb. pretest-posttest control group designc. control-group-time-series designd. nonrandomized control-group pretest-posttest design

Which factors are examples of how technology may have affected the great migration apex