The 24 hour (diurnal) rhythm of our body such as the sleep wake cycle is regulated by the hormone melatonin .

The 24 hour (diurnal) rhythm of our body such as the sleep wake cycle

1.	The 24 hour (diurnal) rhythm of our body such as the sleep wake cycle is regulated by the hormone melatonin .
Answer» The 24 hour (diurnal) rhythm of our body such as the sleep wake cycle is regulated by the hormone melatonin .