Which was left behind when the nile flooded? a. thousands of dead animals b. remains of boats c. nutrient-rich soil d. sand and pebbles

The Nile river would bring rich soil to plant crops, so that is why the priest had to be able to the when the Nile river would flood so they could have food to eat. 

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.