Final answer:
The nail consists of the root, plate, and free margin. The nail grows from the nail matrix at the proximal end of the nail, and the nail bed is where the nail body forms. The nails grow continuously from the nail matrix.
Step-by-step explanation:
The three parts of the nail are the root, plate, and free margin. The nail grows from the nail matrix at the proximal end of the nail. The nail bed is the specialized structure where the nail body forms. The nail bed appears pink due to its rich blood supply, except for the base where the lunula is located. Nails grow continuously from the nail matrix, allowing the nail plate to emerge from the epidermis as it grows longer.