The statement 'both allow citizens to vote for members of the legislature' describes a similarity between presidential and parliamentary democracies. They are different forms of government.
Democracy refers to a form of government where people vote to choose authorities designed to decide legislation.
A presidential democracy is when the presented is voted to be the head of government (president) separately from the legislative system.
Parliamentary democracy is a form of government where the political party having the greatest representation in the legislature forms the government.
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