While Studying the Impact of Nutrition on Intelligence, a Researcher

question 55

Multiple Choice

While studying the impact of nutrition on intelligence, a researcher has one group of rats on a vitamin-rich diet and the other group eating Big Macs. While observing the rats run a complicated maze, the researcher notes that the vitamin-enhanced rats' maze is more brightly lit than the Big Mac rats' maze. The difference in lighting in this study is a(n) _________.

• A) confound
• B) independent variable
• C) dependent variable
• D) hypothesis

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Definitions:

Nasopharynx

The upper part of the throat located behind the nose, forming a passage for airflow from the nasal cavity to the larynx and esophagus.

Laryngopharynx

The part of the pharynx that lies inferior to the epiglottis and extends to the location where the esophagus and trachea diverge.

Oral Cavity

The mouth, an opening in the body where food intake occurs, beginning the process of digestion and housing many taste buds.

Esophagus

The tube that connects the throat (pharynx) with the stomach, transporting swallowed food and liquids.