Arch, whorl, double loops or simple loops. Which one is yours?

Last week we learnt on fingerprints. All we need were stamp pad ink and paper and oh, fingers. First, traced the fingers. Second, stamped the fingerprints. The activity sounded easy, but the following Q&A session wasn't easy at all. I repeat, at all. I explained we have unique fingerprints. Neither of us have same prints. And then they started to ask "Kenapa fingerprints kita spiral, Mummy?", "Kenapa kat fingers kita je ada fingerprints?". Well, I assume that we have both unique fingerprints and toeprints. I still can answer and try to answer those science-based fact questions. But when it came to "Kenapa Allah buat fingerprints?", "Syaitan dan malaikat ada fingerprints tak?". Then I was clueless and tried to escape with "OK, Mummy nak basuh pinggan."