Where was oil production at its highest in the 1980s and still remains important to the russian economy? a. central asia b. the ural mountains c. russian siberia d. the caucasus region

I would say c. hope this helps!

ahaha 8

my answer has to be at least 20 characters so here are the rest of the characters lol

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.