No one invented finger nails.
Nails (and finger nails) have volume.
Finger nails are made of a protein called keratin.
Actually, finger nails contain protein (called "keratin").
By system, you mean category.. I'm not sure if you mean finger nails or like tool nails, so I'll give you both. Finger nails: Body parts Tool nails: Hardware
Finger nails (and toe nails) are made of keratin.
Nails
yes
yes
I believe they grow faster.
Yes, it is like our finger nails
Bathe regularly.
Nails were invented thousands of year ago. The Bronze nails, found in Egypt, have been dated 3400 BC.