Answer:
A president serves as both the head of government and head of state, whereas a prime minister serves only as head of government.
Explanation:In the United States, the president serves as both the head of state and the head of government. In many other countries, the roles of head of state and head of government are held by two different people. In the United Kingdom, for example, the prime minister serves as the head of government, while the king or queen serves as the head of state.