biological clocks
type: Concept
broader: physical and biological development
broader: periodicity
definition: Biological clocks are internal mechanisms that help humans, animals, and other living organisms measure time and regulate the rhythms of their bodies and activities. Most commonly, these clocks tell us when to eat, sleep, rest, become active, and mate. [Source: Encyclopedia of Time: Science, Philosophy, Theology, & Culture; Clocks, Biological]
narrower: circadian clocks

circadian clocks
type: Concept
broader: biological clocks

concepts
type: Collection
type: ConceptGroup
member: biological clocks

periodicity
type: Concept
narrower: biological clocks

physical and biological development
type: Concept
narrower: biological clocks