How many methods are there for taking fingerprints?

You can take someone's fingerprints in various ways. 3 most common are:

1. You rub your finger into pencil lead and then into a see through tape that copies it.
2. You rub your finger into ink and then you just roll it over a piece of white paper
3. You can electronically scan your fingerprint with machines that do that.

Reactants are mean lol

It is evolution, because we all have some of the same traits like eye color or shape or ears.