A. true, I believe it's true
The North China plain is a flatness which has been formed by the time with the sediments of the Yellow river.
As it was not uploaded an image to indicate where this plain is, a picture from google was chosen for this purpose giving some directions on a map of China.
True because it is actually away to count population in certain areas which tells how you may help that area of population
Answer:
The Constitutional Convention of 1787 was called to revise the ailing Articles of Confederation. However, the Convention soon abandoned the Articles, drafting a new Constitution with a much stronger national government. Nine states had to approve the Constitution before it could go into effect.