Parliamentary systems have a prime minister who serves as head of government and sometimes head of state, contrasting with presidential systems where the executive is separate.
Parliamentary systems combine the executive and legislative branches, with a prime minister as the head of government and sometimes the head of state. In contrast, in a presidential system, the executive, often a president, is separate from the legislature. Parliamentary systems like those in the UK feature a prime minister while presidential systems like the US have a president.
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