No planet is more earth-like than Earth itself, so if life really does pop up readily in earth-like conditions, then surely it should have arisen many times right here on our home planet? And how do we know it didn't? The truth is, nobody has looked.
“The more responsibility the Scoutmaster gives his patrol leaders, the more they will respond.”
“Only in art will the lion lie down with the lamb, and the rose grow without thorn.”