Subject: Why did the human line evolve after 'the meteor hit' and not before?

    If humans evolved after dinosaurs were wiped out, what new 
conditions favored human life?  Did we evolve from something that 
already crawled out of the water before the meteor strike or did we 
evolve from something that crawled out after the meteor?   I realize 
not being eaten by dinosaurs favors human life, but there must have 
been something that favored dinosaurs over humans the first time 
around and humans over dinosaurs the second.  ie atmosphere 
composition or climate.   Is there DNA evidence supporting my 
question one way or the other?

Re: Why did the human line evolve after 'the meteor hit' and not before?