one major evidence of global warming is ; a) all the above b) melting of polar ice c) high temperature during winter d) increased precipitation​

Explanation:

Ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers show that Earth's climate responds to changes in greenhouse gas levels.

answer; i believe that the correct answer is ( rivers);

the economic difference between the three colonial regions. shipbuilding, whaling, fishing, and trapping where also main factors to the economy. the southern regional colonies economy was based on sugarcane, rice, cotton, tobacco, and indigo.