| A | B |
|---|
| biological clock | an internal timer inside an organism that keeps track of time |
| diurnal | animals that are active during the day |
| nocturnal | animals that are active during the night |
| migration | rhythm that makes an organism travel from where it is born to where it feeds |
| tidal rhythms | rhythms that are controlled by the moon |
| estivation | summer resting state |
| hibernation | winter resting state |
| annual rhythms | rhythms that occur with the seasons |
