The Jewish High Priests, the main two being Caiaphas and Annas, at the time of Jesus of Nazareth, made a decision. Their nation and people were at the mercy of the Romans, and they were allowed to continue practicing their faith and keeping their culture alive. Caiaphas, Annas and the other High...
There is also the theory of spontaneous chemical reaction which on a new planet such as ours where the temperature is very high(which tends to act as a catalyst) can lead to the combining of the right chemicals to create a simple life form.