How does kidney stones affect the excretory system ?

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

How did southerners view andrew johnson and republicans in congress

Which of the principles do you feel is more important for our our american society? respond in 3 sentences. (principals: popular sovereignty, republicanism, federalism, separation of powers, checks and balances, limited government, or individual rights)