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Beth Plays the Lowest Note on Her Ukelele, a Middle

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Beth plays the lowest note on her ukelele, a middle C. Penny plays a middle C at the same volume on a harp. In this instance, the difference in sound between the two instruments represents a difference in:


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Measuring Stress

The process of assessing the level of stress an individual experiences, often through various physiological and psychological tests.

Researchers Use

The application of various methods and tools by scientists to conduct experiments, gather data, and test hypotheses.

Nervous System

The part of an organism that coordinates its actions by transmitting signals to and from different parts of its body.

Central Nervous System

The part of the nervous system that includes the brain and spinal cord, responsible for processing and transmitting messages throughout the body.

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