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I think the correct word to fill in the blank would be follicle.The shape of the hair is determined by the curvature of the follicle. A hair follicle is a mammalian skin organ that produces hair. Hope this answers the question. Have a nice day.

Answer:

Follicle

Explanation:

The shape of the hair is a trait that is dependent on the curvature of the hair follicle.

If the shape of the hair follicle is a straight cylindrical shape then this generates straight hair while curved hair follicles generate curly hair. 

Thus depending on the hair follicle a person may have straight, wavy or curly hair. 

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