Final answer:
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.
Explanation:
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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