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Which of the following do the authors say form when keratinized dead cells thicken in places where they are subject to friction?

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Questions below are based on the following information.

This passage is adapted from Anatomy & Physiology of Farm Animals, 7th Edition, by Rowan D. Frandson, W. Lee Wilke, and Anna Dee Fails.




Which of the following do the authors say form when keratinized dead cells thicken in places where they are subject to friction?






 
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