Read this http://news.bbc.co.uk/2/hi/science/nature/8550504.stm as you dream about the possibility of life on other worlds...for the events that ravaged the Earth 65 million years ago brought about life as we know it and are still in it.
In order for life [or intelligent life if you will] on other planets to exist, their planet containing similar early flora and fauna must go through similar havoc to bring about similar circumstances for their own life to be known so that we know them! They must surely go through a transformation of their own 'DNA' and evolve from quadra-peds to bi-peds like us...wouldn't you think?
Now>>>does a moons' tidal movements [if there are any habitable planets with moons] come into play on a planet in the habitable zone (HZ) have anything to do with life? [intelligent or not]
Just a few thoughts!
this is my first 'link'...not sure what will post.