ABSTRACT
To have life is to have rhythmicity. For animals it is physiologically based and behaviorally expressed, from the simplest single-celled organism to the aggregate functioning of the most complex organism. For plants rhythmicity is self-evident in their annual growing cycles. The ubiquity of this quality of life is not mere hyperbole. It is based on scientific observations from countless investigations, demonstrating at all functional levels the temporal parameters of rhythms 1 with period, amplitude, and phase relationships.
