Where did life come from?

I was thinking today.

Mars has an atmosphere. Right?

Why was it that after the dinosaurs became extinct that there was all of a sudden humans on earth?

Did humans used to live on mars? But the greed of man destroyed it.
Nuclear warfare destroyed everything on mars so we had to come to earth to seek a new life.

If you think about timezones, isnt there an intergalatic timezone?
I mean, life on mars was so far ahead than on earth.

Summary
Humans used to live on mars, but the fate of humans kicked in by nuclear warfare. Destroying everything, only few humans survived and moved on to another planet (earth). The humans on mars were studying earth and what its predators were, what its prey were and how we could survive. All of a sudden an asteroid hit earth and wiped out the top predators. ( Dinosaurs) giving humans a chance to survive.

If you think about nuclear warfare for a second. When a nuclear bomb is let off, the whole area around it gets destroyed. Was there a huge nuclear war long before humans existed on earth?

Did humans endanger humans?
How come humans all of a sudden appeared on earth?

Just get what im saying and think about it.

Its mindblowing.