When you really think about it, human fingernails are similar in function to claws in other animals, except they don't dress them up with colorful paint. What substance makes up fingernails?

Fingernails are made from a tough, protective protein called keratin. Made up of dead skin cells, this protein is also found in the hooves and horns of various animals.

Asked by Rachel Bortles · Last updated 5 years ago · 83.2K views · SOURCE