Explanation

• The parliamentary system of Government was introduced in the 1973 constitution.
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• The 1973 Constitution, is the supreme law of Pakistan.
  
• Zulifqar Ali Bhutto introduced the 1973 constitution in Pakistan on August 14, 1973.
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• According to the 1973 constitution, the Provincial Assembly, National assembly, and senate elect the President.
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• Whereas the prime minister is elected by the only national assembly.
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• The bicameral Legislature system was introduced for the first time in Pakistan in the constitution of 1973.
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