Which is an invention that improved safety for railway passengers? O refrigerated rail cars
O Pullman sleeping cars
O time standardization
O air brakes

Roosevelt's “four freedoms” speech relies so heavily on emotional appeal that its structure is missing .

1. what was william harvey's discovery about the human body? @ two types of blood flowed through the veins and arteries. b four fluids existed in the body: blood, yellow bile, black bile, and phlegm. © the same blood flowed through the veins and arteries. d ancient ideas of human anatomy and bodily functions were wrong. done

How did enlightened thinkers believe government regulation affected the growth of wealth and trade