Brainliest what are fingernails made of?

Fingernails grow from the matrix. The nails are composed largely of keratin, a hardened protein. As new cells grow in the matrix, the older cells are pushed out, compacted and take on the familiar flattened, hardened form of the fingernail.. :3

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.