Leader who united the Mongols and conquered eastern China and Central Asia

A. Mongols

B. Genghis Khan

C. Kublai Khan

D. Marco Polo

E. steppes

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

After nine states had ratified the constitution by mid-1788, other states quickly followed. all thirteen states had to obey it. it became law in the united states. none of the states had to obey it.

So i need to know the answer to thisi