Does communism allow citizens to elect leaders

No.

Explanation:

Communism always led to totalitarianism and Tyranny, and ends with absolutism and destruction of the rights of the people.

What you are talking about is Democracy, in which direct democracy allows citizens to vote for leader candidates directly, while indirect democracy allows citizens to vote for voters, who in turn cast votes for the candidacy of office.

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a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.