The adrenal glands control internal sleep and waking cycles.

The statement is false. The body’s main internal clock is in the suprachiasmatic nucleus of the hypothalamus, and melatonin from the pineal gland helps regulate sleep and waking. The adrenal glands produce hormones such as cortisol and adrenaline, but they do not control the internal sleep-waking cycle. Therefore, the correct choice is B, F.

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