... organisms have evolved an internal representation of time, which
governs transitions in the life cycle, and proficient use of environmental cues to
time these transitions. Such an internalisation of time has been a key, ancient
innovation for coping with seasonal environments. Therefore, across taxa in
biology, organisms show genetically programmed, endogenous timing mechanisms.
These are modified according to the particular, local environments of
individuals and populations. The annual processes can occur periodically under
constant environmental conditions and are formally described as circannual rhythms ...

Ibid.

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