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Biology 9 Online
OpenStudy (anonymous):

Which element is most important for adding strength to hair, feathers, and outer skin? A. oxygen B. hydrogen C. sulfur D. phosphorus

OpenStudy (anonymous):

the answer is D for anyone who needs help

OpenStudy (anonymous):

Are you sure it isn't C because sulfur is needer for dissulfide bonds in cysteine which gives molecules strength

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