The correct answer to this open question is the following.
Although you forgot to include the excerpt and the options of the question, we can say the following.
Despite geographic separation and diverse environments, many American Indian peoples used some common practices. According to the excerpt, the practice that was unique to the Plains Indians was the use of domesticated horses in hunting and warfare.
These Native American Indian tribes used horses for primary necessities and activities to survive. They were farmers and hunters. They needed to go hunt animals to feed their families. In the 1600s, the horse represented the chance to effectively hunt animals and a great asset when they wage war against other tribes. Among these tribes that used to hunt Buffaloes as their primary hunt, were the Comanche, Arapaho, Cheyenne, Apaches, and Lakotas.
C the government is the answer
Where is the blank? I’m sorry to answer without a answer just elaborate in comments
Four years, every 4 years voting takes place
The constitution of the United States set up a set of checks and balances among the three branches of government. The Legislative, Executive and Judicial powers constitute the structure of the american government, and they have power to check each other's way of work.
One example of the check and balance system is that the Supreme court of the United States may check congress by declaring a law passed by this one as unconstitutional. This is a clear check limit used against the legislative power, that is the congress. But on the other hand, the power is balanced because the members of the Supreme Court are appointed by the President of the country (the Executive power), and to be appointed they have to be approved by the Congress.