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Molecular clocks For the past 40 years, evolutionary biologists have been investigating the possibility that some evolutionary changes occur in a clock-like fashion.
If you have traveled across several time zones, you have experienced this synchronization.
It acts as our central pacemaker, checking the cycles of light and dark outside, and then sending signals to synchronize clocks throughout the rest of the body.
Molecular processes occur so fast that is it difficult to imagine a 24-hour clock that works at the molecular level.
So cells have a way of synchronizing their clocks with the outside world.
The clock in our brain is synchronized by exposure to light.