What is characteristic of the economic activities and levels of development in Russia, Central Asia and the Caucasus?

"Central Asia is an extremely large region of varied geography , including high passes and mountains, vast deserts, and especially treeless , grassy steppes , "

"Foreign trade is tremendously important to the Russian economy. The country has generally enjoyed a healthy trade surplus since the dissolution of the solvet Union .Primary exports include oil ,metals ,machinery, chemicals, and foresty products. "

answer; (d) melting of sea ice;