system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How does Surtur and the rest of the fire demons fit in a scientifically explainable universe?

What is their physiology?How do they come to life?Can all fire demon manipulate fire?Is the Fire Dragon a hybrid of a fire demon and an other race?As we see Surtur is not a normal fire demon because his whole being is connected to a crown.So is he a magically created being and If yes by who? Also is the eternal flame part of Surtur's being or it is just a relic?
gpt
It's simple. The universe (MCU) is not scientifically explainable across the board. Things might have that way years ago, but now there are numerous examples of magic in the universe: Scarlet Witch and Doctor Strange being the primary examples.