Can someone help me with question numbers 18,19,20,21, and 22. This packet is due really soon!

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

What is the purpose of biofertilizers? a reduce pollution b. reduce insect threats c. reduce erosion d reduce herbicide use select the best answer from the choices provided 0 0 0 0

How did the treaty of versailles cripple germany after world war one ?