Is it time to wind up the biological clock?
D000818:Animals; D001683:Biological Clocks; D001717:Birds / Q000502:physiology; D002940:Circadian Rhythm; D005724:Ganglia / Q000502:physiology; D005815:Genetic Code; D007313:Insecta / Q000502:physiology; D008027:Light; D010507:Periodicity; D010860:Pigments, Biological / Q000502:physiology; D018521:Plant Physiological Phenomena
D010860:Pigments, Biological