Biology
Biology, 16.09.2019 23:30, livirose1514

Our natural daily patterns of waking and sleep are called โ€“ rhythms. exposure to daylight or darkness causes the hypothalamus to signal the โ€“ gland, which regulates the amount of โ€“ in the bloodstream, so that production of this hormone is โ€“ during daylight hours than at night.

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Our natural daily patterns of waking and sleep are called โ€“ rhythms. exposure to daylight or darknes...

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