Why do we (including other living organisms) reproduce? Why is it necessary that our race keeps flourishing and multiplying? I couldn't find any useful articles on google except for some yahoo and wiki answers which I don't like much. I would like if someone could suggest me some books or redirect me to some useful articles. Also, this might sound more of a question pertaining to biology but do unicellular organisms have mind and feelings? Just in case if they don't, then whats the motivation behind their reproduction?