Final answer:
The structures and organizations that shape political behavior are called institutions, which include formal entities such as legislatures, executives, and judiciaries.
Step-by-step explanation:
The structures and organizations that shape political behavior are called institutions. These can include the formal institutions like legislatures, executive branches, courts, and political parties, as well as informal ones. Institutions set the rules and practices that inform their members about their relationships with one another and dictate how they should interact. For example, in the context of government, legislatures are responsible for lawmaking, constituency service, and oversight. The executive branch, typically led by a president or prime minister, enforces laws, while the judiciary interprets them. These are key components of a country's political system.