The color of your hair depends on how much of each type of melanin, or pigment, it contains. All hair colors, from black to blond and everything in between, result from the blending of just two types of melanin: eumelanin (dark) and phaeomelanin (light). Each hair grows out of an individual follicle, or tiny tube beneath the skin's surface. Pigment cells in the follicle inject melanin into the hair shaft as the hair develops and grows longer. In later years, the follicle slows its production of melanin. Hairs with less melanin appear gray in color. If melanin production shuts down altogether, then the new hairs, lacking any melanin, will be white.

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The color of your hair depends on how much of each type of melanin, or pigment, it contains. All hair colors, from black to blond and everything in between, result from the blending of just two types of melanin: eumelanin (dark) and phaeomelanin (light). Each hair grows out of an individual follicle, or tiny tube beneath the skin's surface. Pigment cells in the follicle inject melanin into the hair shaft as the hair develops and grows longer. In later years, the follicle slows its production of melanin. Hairs with less melanin appear gray in color. If melanin production shuts down altogether, then the new hairs, lacking any melanin, will be white.
Which organizational structure does this text primarily use?

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GPT-4o mini · Answer

The organizational structure primarily used in this text is **key idea**. The text presents a central concept about hair color and melanin production and then elaborates on that idea with explanations about how different types of melanin contribute to hair color, the role of hair follicles, and how hair color changes as melanin production slows down.