All of the following are potential effects of clearing land except a. less biodiversity b. less arable land c. more co2 emissions d. more erosion

The correct answer is B. Less arable land.
Arable land is the main reason why the land is cleared. Arable land is the land that is suitable for ploughing and of sufficient quality for growing plants. So for this reason, the forests are cleared (by cutting the trees and bushes) and more land for agriculture is gained.

Ibelieve the answer is c also i'm in k12 too

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years