OUT­SIDE STIM­ULI SET CLOCKS

World of Animals - - Animal Clocks -

Ex­ter­nal cues like light and tem­per­a­ture are known by the scary-sound­ing name ‘ex­oge­nous

zeit­ge­bers’. This trans­lates to ‘out­side time-givers’, and these in­di­ca­tors of pass­ing time re­set the bi­o­log­i­cal clock in an­i­mals, plants, fungi and even

cyanobac­te­ria.

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