Examlex
Briefly describe social networking, and give examples of social networking sites.
Longitudinal Method
A research design in which the same individuals are observed or tested repeatedly over a period of time.
Free-Radical Theory
An idea that posits the aging process in organisms is a result of cells accumulating damage from free radicals over time.
Unstable Oxygen Molecules
Often referred to as free radicals, these are molecules with unpaired electrons that can cause oxidative damage to cells and tissues.
Empiricism
Empiricism is a theory that states that knowledge comes only or primarily from sensory experience.
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