A Natural Experiment Is an Empirical Study ________

question 49

Multiple Choice

A natural experiment is an empirical study ________.

• A) in which the predictions of the model are not required to be tested with data
• B) that can only be used to understand natural phenomena and is widely used in subjects such as physics and biology
• C) in which the researcher assigns subjects to the control and treatment groups to verify a cause-effect relationship
• D) in which some process, outside the control of the experimenter, has assigned subjects to the control and treatment groups in a random or nearly random way

---

Definitions:

Calcium

A chemical element symbolized as Ca, essential for many bodily functions including bone formation, muscle contraction, and blood clotting.

Muscle Contraction

The process where muscle fibers shorten and generate force as a result of interactions between actin and myosin filaments.

Synergist

A muscle that assists another muscle in accomplishing a movement by helping reduce undesired motion or by stabilizing joints.

Prime Mover

A prime mover, in anatomy and physiology, refers to the muscle that plays a leading role in performing a particular movement by contracting, while other muscles may play supportive or stabilizing roles.