The hair shaft is made up of three layers; the cuticle, cortex, and

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Multiple Choice

The hair shaft is made up of three layers; the cuticle, cortex, and

Explanation:
The hair shaft is organized into three concentric layers: the outer protective layer (cuticle), the middle layer (cortex), and the inner core (medulla). The medulla is the innermost layer of the shaft and may be present or absent depending on the hair type, but when it is there, it completes the three-layer structure. The dermis is a skin layer surrounding the hair follicle and is not part of the hair shaft, and keratin is the protein that hair is made from rather than a separate layer.

The hair shaft is organized into three concentric layers: the outer protective layer (cuticle), the middle layer (cortex), and the inner core (medulla). The medulla is the innermost layer of the shaft and may be present or absent depending on the hair type, but when it is there, it completes the three-layer structure. The dermis is a skin layer surrounding the hair follicle and is not part of the hair shaft, and keratin is the protein that hair is made from rather than a separate layer.

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