Yes, because every type of possible lifeform in the timeframe of 4.5 billion years has already been created on earth. Unless you are going to argue that aliens and predators aren't carbon based lifeforms. Aliens are possibly biomechanical but I can't say the same thing about predators.
The thing is, if non-carbon based lifeforms could develop - then why haven't they done so on earth (earth is rich in silicon and other elements)?