benburrows

Simple.... Yoda Seriously... read 'A brief history of time' by Stephen Hawking, and then one of numerous books on evolution (The greatest show on earth, by Richard Dawkins is quite good) That should give you some answers

I think you just answered your own question there. Must have forest as well as rain.... (Although if the forest has been cleared this might be a bit of a fuzzy area). But no, there isn't enough rain. Should have at least 68 inches a year