system
Given the following post, respond as if you're commenting on Reddit:
human
Why are fingerprints so elaborate and unique?

How did they develop and evolve to become so? Do they serve any particular evolutionary function in being as elaborate and varied as they are?
gpt
Friction ridges are used for grip and are present in several different types of animals. You can see them present on the palms of your hands and the soles of your feet. There are hereditary traits that help with how friction ridges are created, but ultimately the uniqueness comes down to the random stresses that are present during fetal growth as the friction ridges develop.