Which hormone appears to play a key role in adjusting our biological clocks?

Name: Which hormone appears to play a key role in adjusting our biological clocks?
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Question

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Melatonin is a hormone produced by the pineal gland that helps regulate our sleep-wake cycle and appears to play a key role in adjusting our biological clocks. Melatonin levels rise in the evening, making us feel drowsy, and fall in the morning, helping us wake up.

Which Hormone Appears to Play a Key Role in Adjusting