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The __________ acts as the internal clock that controls sleep and waking cycles. A. Hypothalamus B. Pineal gland C. Ovaries D. Thyroid.
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The __________ acts as the internal clock that controls sleep and waking cycles. A. Hypothalamus B. Pineal gland C. Ovaries D. Thyroid.

User Tomblah
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Answer:

The answer is B

Step-by-step explanation:

Hope this helps:).....if not sorry for wasting your time:)

User Scott Nimrod
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