Unit 2

#1 Yes, because it could of been a goldilocks condition where everything was perfect.
#2  I think key turning points of the Big Bang was when Earth got life and then humanity rose from that. Dinosaurs and fossils from a long long time ago supports what I have learned. I believe that you need evidence that it is possible for certain chemicals to have a massive explosion and create random objects.
#3  No, I do not think the CMB is convincing evidence for the Big Bang. Theories like the Big Bang needs enough facts and support from scientist for it to be largely accepted.