This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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The primary substance that makes up a bird's feathers and a human's fingernails is a tough, fibrous protein. A. Keratin is the correct answer. It is a structural protein that forms the main component of hair, skin, nails, feathers, horns, and claws in many animals. B. Calcium is a mineral primarily found in bones and teeth. C. Collagen is a protein found in connective tissues, skin, and bones, providing strength and elasticity. D. Chitin is a polysaccharide found in the exoskeletons of insects and crustaceans, and in the cell walls of fungi. The correct answer is A. A. Keratin Send me the next one 📸