___ is a hormone secreted by the pineal gland that plays a role in regulating biological rhythms and immune function.

___ is a hormone secreted by the pineal gland that plays a role in regulating biological rhythms and immune function.

___ is a hormone secreted by the pineal gland that plays a role in regulating biological rhythms and immune function.


A. growth hormone
B. melatonin
C. LH
D. FSH


Answer: b. Melatonin


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