Paint themorbite them, can you imagine living your life without fingernails?
On a more practical note, fingernails are also pretty great for scratching and opening packages.
According toABC Education Australia, the reason we have fingernails is simply that we have evolved to have them.

Like chimpanzees, gorillas, and orangutans, humans are primates.
All primates have evolved to have nails from a common ancestor who had claws.
Just be sure to fill your fridge with fish, leafy greens, eggs, and nuts, too.
