What should be changed to make the sentence to be true is "do not". To invalidate the statement, the inversion or opposite will be state. "states of consciousness vary over the course of the day."
The extent at which we are aware of our thoughts, perceptions and surroundings is the level of consciousness. It is the level of awareness of both internal processes and external surroundings is known as a state of consciousness.
Therefore, the correct answer is "states of consciousness vary over the course of the day."
learn about state of consciousness: https://brainly.com/question/20348582
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