This is my homework and i'm having some i know it looks easy but i can't decide what the answer is plz .

Which powers best complete this graphic?

Predict how the transcontinental railroad will make a difference in the civil war. now, research the inventions of the 19th century. tell what other inventions of the 19th century will change the way people see and remember the war? why?

In watson’s little albert experiment, what does the loud metal clanging noise represent? a: neutral stimulus b: unconditioned stimulus c: unconditioned response d: conditioned stimulus e: conditioned response