Analyze the following scenario and explain the underlying biological principle that accounts for the described issues.

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All living systems, human or otherwise, have predictable rhythms of biological activity that they follow. There are daily rhythms such as sleeping or eating, and annual ones like hibernation.

Biological rhythms

- Types of biological rhythms
- Sleeping and waking
- Changes in biological rhythms
- Suprachiasmatic Nucleus

Focuses of Biological Rhythms

A researcher observes a species of plant in a laboratory with no windows and constant, unchanging artificial light. Despite the lack of external day/night cues, the plant's leaves consistently open in the morning and close in the evening on a roughly 24-hour cycle. Which of the following concepts best explains the plant's behavior?

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