What was significant about the first civilization in china

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.

This passage says that the government is necessary because . the passage states that checks and balances are needed to

What notable contributions to science has sandia national labs (snl) produced over the years?