Which of the following examples is a function of your circadian rhythm? i .your body increases the production of red blood cells when at higher elevations. ii. your body temperature follows a regular pattern of increases and decreases each day. iii. your body secretes the hormone melatonin at night. a)i only b)i and ii c)ii only d)ii and iii

The correct answer is option d)"II and III".

Explanation:

The circadian rhythm is a cycle that involves multiple that involve physical, mental, and behavioral changes occurring during a day time period of time. Therefore, only changes occurring in a 24 hours span are considered part of the circadian rhythm. Two examples are the body temperature following a regular pattern of increases and decreases each day, and the body secreting the hormone melatonin at night. A healthy person experiences a change in its body temperature of about 0.5 °C each day, with the lower temperature occurring in the morning and the higher temperature occurring at night. Regarding the hormone melatonin, the body secretes this hormone during night and helps people to relax and sleep.