Do you think it is possible for europa to harbor some sort of life? what kind of life would you expect and what energy source would it use?

It would be possible for Europa to harbon very alien-like specific microbic life which we haven't had the chance of encountering before. The reason would mostly be because it has a liquid present but that liquid of course is not water. It would probably also use 

From 1841-1850, 1.3 million people moved  overseas, the greatest part around 70% went to the  USA, the rest of them shipped to Australia and only 2% to  Canada.  A lot of people died because of different diseases during the trip and the conditions were terrible. In the USA, quarantine centers were established for arriving ships, where sick emigrants recovered. The emigration continued until the  First World War. Canada and Australia reacted in a different way, because the amount of emigrants was much lower, the greatest part of emigrants decided to move to the  USA. Emigrants had the poorest jobs and bad conditions for life in the USA.