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Biology, 02.08.2019 13:00 mshepherdmiller

What is the function of the protein keratin? a. to provide support and structure for cells in hair, skin, and nails b. to fight infections caused by bacteria and viruses c. to increase chemical reaction rates in the digestive system d. to transmit chemical signals throughout the body (awarding brainliest to the best answer, since i have 17 minutes to get this answer.)

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