What is the most common political unit in our world today?

What is institutional discrimination in the social work field

The soviet union and the united states believed in two very different economic systems. what were the names of each?

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