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Mrs. Swindell, during a lecture on the importance of proper hygiene, notices that Phil and Todd (the class clowns) are quietly plotting a scheme in the back of the room. The other students are not aware of the scheming, and Mrs. Swindell smoothly continues with the lecture. Upon completion, she calls the boys aside and, as the class works on another project, explains why their behavior is unacceptable. This example illustrates the use of
Sound
Audible frequencies that propagate through the air or another carrier and are perceptible when they make contact with a human or animal's ear.
Fetal Development
The stage of human growth within the womb from conception to birth.
Reflex Response
An automatic, involuntary reaction to a specific stimulus.
Painful Stimulus
An external or internal event or trigger that can cause a physical or emotional experience of pain.
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