Under the corvée labor system in the Belgian Congo

chlorofluorocarbons are released via: aerosol sprays and refrigerants.

the growing interconnectedness of the world through communication, trade, and the exchange of ideas is an important theme in the history of the 20th and 21st centuries.

explanation:

1

b gas tractor

2

c and negotiated lower prices for farm equipment and supplies

3

d the grange

4

c over 15,000 bankrupt businesses

5

c people became more self-sufficient