Why did early chinese civilizations and dynasties thrive for thousands of years with little outside influence?

a: the great wall prevented invasions

b: the chinese did not need to trade for goods and resources

c: mountains and deserts provided natural barriers

d: china is protected by water on all sides

Which of these were true of the sandinistas? select three options.they were led by daniel ortega.- they created the somoza dictatorship,they received aid from the ussr.they received aid from the u.s.they supported revolutions in el salvador.

Which of these statements best describes the court's ruling in new jersey v tlo? students are not protected under the fourth amendment. students are protected from unreasonable search and seizure, the fourth amendment was found to be unreasonable, every time a student is searched, a police officer must be present.

The map shows information about river valley civilizations. which feature of this map best the reader determine the distance between two places?