There are three types of basic economic systems and they are traditional, command and market.
Answer: B
Explanation: Good luck! :D
Answer:
Russia is experiencing major changes in its ecosystem and is warming 2.5 times faster than the average global rate. In addition to melting ice in the Arctic and the loss of drinkable water due to depletion of the ozone layer, snow is thawing in Siberia and in northern regions of Russia
Explanation:
They act like dams or form long ridges of land.