What is a main foreign or defense policy threat posed by Iran?

Some multinational corporations sell goods, whereas others, like McDonald's, sell __________

Fill in the blank with the appropriate word.

The checks and balances contained within the Constitution result in which of the following?

a. consolidation of power in the executive branch, since the House and Senate are usually at odds b. some capacity of each of the three branches to limit the power of the other two c. a national bank of the United States d. separation of power so that each branch can operate independently of the others