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How often does head shape change?
Every quarter inch
Every half inch
Every inch
Every two inches
The correct answer is: Every half inch
Head shape can vary from person to person and can also change over time. However, it is not common for head shape to change in small increments such as every quarter inch (option A) or every half inch (option C). These changes tend to happen in larger increments, such as every inch (option C) or every two inches (option D). Therefore, the most accurate answer is option B, as the size and shape of one's head may typically change about every half inch.