Life, the Universe, and Everything

I believe the universe, at least the observable one, was created as a result of the big bang, an explosion of matter from a high density and high temperature state.  What caused this state, be it a singularity or a god or a computer simulation, I am unclear on.  The universe expanded rapidly and the high energy particles eventually cooled.  Particles began to be attracted to one another and eventually over time formed the stars, galaxies, black holes, planets, etc.

Earth was one of these planets created at some point and it was largely uninhabitable for a long time until such conditions were met that the building blocks of life could form.  Amino acids, lipids, nucleic acids, etc were formed and, over time and through some mechanism formed the first single cell organisms.  Whether some spontaneous spark occurred or whether some meteor crashed carrying some protein is unclear to me.  These building blocks of life increased in complexity until self replication was possible giving way to a precursor to genes.  In order to continue replication, the molecules needed to protect themselves and eventually cells were formed.  Keep increasing the complexity and given a ton of time, multi-cellular organisms form and then yadayadayada you get algae, fish, mammals, dinosaurs, humans, etc.  I’m glossing over a bunch of stuff because its a complex topic and I only have 250 words to say it.  A too long, didn’t read version would simply be science and physics and stuff.