The answer is protein. The nails and also the hair compose of protein. It is used for building as well as repairing tissues. It is also being used in making enzymes and other chemicals. It is a vital block of bones as well as muscles,skin, the cartilage and the blood.
The answer is Protein. T<span>he primary type of macromolecule in the actin and myosin that make up muscle cells is Protein. </span>Muscles<span> are composed of two major protein filaments: a thick filament composed of the protein </span>myosin<span> and a thin filament composed of the protein </span>actin<span>. </span>Muscle contraction<span> occurs when these filaments slide over one another in a series of repetitive events.</span>
