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Pineal Gland is the gland which is  thought to be playing a role in establishing 24-hour circadian rhythms

Pineal gland is a tiny gland in the brain that's located beneath the back part of the corpus callosum. It's a part of your endocrine system and secretes the hormone melatonin .Your pineal gland's main job is to help control the circadian cycle of sleep and wakefulness by secreting melatonin.

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brainly.com/question/13061431

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