A _____ Is a Scientific Concept That Has Been Tested

question 30

Multiple Choice

A _____ is a scientific concept that has been tested and is in all likelihood true.

• A) concept
• B) hypothesis
• C) theory
• D) scenario
• E) belief

---

Definitions:

Sleep cycle

A period of sleep composed of multiple stages, including REM and non-REM stages, that repeats several times throughout a night's sleep.

NREM Stage

Non-Rapid Eye Movement sleep stage, which consists of three stages of sleep that precede REM sleep, characterized by slower brainwaves and physical relaxation.

REM

Rapid Eye Movement, a phase of sleep characterized by fast and random movement of the eyes, associated with dreaming.

Obstructive sleep apnea

A disorder characterized by repeated pauses in breathing during sleep due to throat muscles intermittently relaxing and blocking the airway.