They needed to maintain a certain level of strength for "duties".
The fact that the government is divided into three branches is known as the "division of power" - the power is distributed to avoid power abuse, so that no instance has unlimited power.
The fact that the three branches are overlapping is known as "checks and balances" - the branches check the other ones (whether their function is lawful) and balance each other.
What are the answer choices?
Xingu River. The easternmost river leading into Amazon
