Which of the following most accurately describes the brain during sleep?
a. the brain goes dormant and does not emit brain waves.
b. the brain remains active and emits brain waves.
c. the brain goes dormant and emits brain waves.
d. the brain remains active and does not emit brain waves.

The correct answer is B) The brain remains active and emits brain waves.

The brain remains active during sleep time and it emits different brain waves ( like theta wave, alpha wave) through different stages ( like NREM- Non rapid eye movement and REM- rapid eye movement stage)

During sleep, the cells of the body are re-energised and the toxins are removed from the brain.

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explanation:

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.