The changes in the biochemical composition and physiology occurring at regular intervals in 24 hours is termed as:

Explanation

Circadian rhythms are intrinsic 24-hour cycles that affect physiological, mental, and behavioral functions in living organisms. These rhythms align with the Earth's rotation, resulting in predictable changes in response to light and dark cycles. The incorrect options are:Geoannual rhythm: Relates to yearly changes, not daily.Lunar rhythm: This rhythm is based on the moon's phases, approximately 29 days long.Tidal rhythm: These rhythms are dictated by tidal patterns, typically occurring over about 12 hours, not 24 hours.