Examlex
A subtype can become a supertype if the subtype has other subtypes beneath it.
Melatonin Release
The secretion of the hormone melatonin by the pineal gland, regulating sleep-wake cycles.
Darkness
The absence of light in an environment, resulting in limited visibility.
Homeostasis
The regulation of internal conditions within an organism to maintain a stable, constant environment despite external changes.
Biological System
An organized group of organs and structures that work together to perform a specific function or task in a living organism, such as the nervous system or respiratory system.
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