According to the article, why did the Mongols conquer new territory? A. to stop Alexander the Great from taking over area

B. to spread their culture to other parts of the world

C. to find new people to charge expensive taxes

D. to gain control of trade on the Silk Road

How do economists measure the success, or shortcomings, of the economy?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

2) based on the information, which is an opinion rather than a fact about immigrants to north america? immigrants