sirrealdan,
1. Approximately when did life on earth start?
No one knows for sure.
2. How old is the rest of the Universe?
3. Did dinosaurs ever exist?
Yes.
4. Did we, and animals, evolve, or are we pretty much unchanged from original (created) "templates"?
'Pretty much' yes. There are lots of different kinds of dogs, but they still dogs...for e.g.
