Though the incas lacked wheeled tools and draft animals, their economy was based primarily on
a) engineering.
b) farming.
c) mining.
d) transportation.

Which best describes how president kennedy apples to the audiences at the beginning of his speech?

Full-service brokerage firms a. have lower commissions. c. provide no investment advice. b. offer portfolio management. d. teach you how to do market research.

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste