Hich did not contribute to new york city's terrible pollution problems in the late 1800s? a. pneumatic subway b. horse and pig manure c. oil refineries d. insufficient sanitary services

If the ussrs economy has remained agricultural-based rather than industrial, then a. the unemployment rate among men would have been much lower b. women would have been less in demand in the workforce c. crop productivity would have led to larger , better nourished populations d. children would not have had to leave school early to work in factories