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Which of the following is NOT an example of endogenous change,in which internal validity is compromised because of natural developments in the subjects,independent of experimental treatment?
Dermis
The middle layer of the skin, which contains connective tissue, nerve endings, hair follicles, sweat glands, and oil glands.
Subcutaneous Layer
The layer of fat and connective tissue beneath the skin that serves as insulation and an energy reserve.
Hemorrhage
The loss of blood from a broken blood vessel, either inside or outside the body.
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