Originally posted by: K.Universe.
Earth is in a Goldilocks zone but it's not so much about planetary habitability as it is about life arising from non-living matter. There is no "switch" to turn non-living to living; scientists are still trying to construct a living cell from the ground up.
Too many evolutionary transitions such as abiogenesis, eukaryogenesis, reproduction and multicellularity had to happen (most of them by chance, we are told) because, of course, science can't invoke God :) Never mind the fact that the DNA as a code is too complex to even understand its full functionality (what we don't understand, we term it as non-coding Junk DNA) but we are being told that it came about via natural processes.
That said, even on earth, it took billions of years before we "intelligent civilizations" came along. And, without dinosaurs going extinct, we most likely wouldn't be here.
Microbial life is possible elsewhere but the emergence of intelligent life on other planets is next to impossible, mathematically speaking.