'This "rhythm" is the biological clock in humans, based on a 24-hour cycle'
the circadian rhythm
JUST THE FACT, MA'AM: This rhythm is the biological clock in humans, based on a 24-hour cycle
This "rhythm" is the biological clock in humans, based on a 24-hour cycle
This "rhythm" is the biological clock in humans, based on a 24-hour cycle
JUST THE FACT, MA'AM
the circadian rhythm
JUST THE FACT, MA'AM