#biological_time  the time of various biological processes
  supertype:  #time  the continuum of experience in which events pass from the future through the present to the past
  subtype:  #circadian_rhythm__circadianrhythm  a daily cycle of activity observed in many living organisms
  subtype:  #menopause__climacteric__changeoflife  the time in a woman's life in which the menstrual cycle ends
  subtype:  #climacteric  a period in a man's life corresponding to menopause
  subtype:  #gestation_period__gestationperiod__gestation  the period during which an embryo develops (about 266 days in humans)
  subtype:  #refractory_period  (neurology) the time after a neuron fires or a muscle fiber contracts during which a stimulus will not evoke a response

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