Final answer:
Hair turns gray when the hair root loses melanin pigmentation, making the hair appear gray or white. However, the loss of pigment does not significantly change the ease of hair removal by waxing.
Step-by-step explanation:
When hair turns gray, the hair root loses its melanin pigmentation, leading to the loss of color and the appearance of gray or white hair. The correct answer to your question about what happens to the hair root when the hair turns gray, and whether it becomes easier or harder to remove by waxing is: a) Hair root loses pigmentation; harder to remove.
This loss of pigment in the hair root does not necessarily affect the difficulty of removal through waxing significantly. The hair's texture and structure, not just its color, influences how easily it can be waxed.