Which of the following is not a Roman contribution to engineering and architecture? A aqueducts B paved roads C Colosseum D mosques

Ahistorian who compares the expansion of political systems to the expansion of economic systems is organizing history by o a. region b. culture c. period d. theme

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

Why do many scientists suppose the land bridge theory of migration?