Essay on when grow up i want to become doctor 250 words
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Keratin is a protein made by cells inyour skin that make up your hair andnails. As keratin cells naturally push upward through the skin, they die and then harden, turning into your hair ornails. ... Hair grows an average of 3 inches a year, whereas nails usuallygrow about 1 1/2 inches a year.Jul 18, 2017
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