/sci/ - Science & Math

The thing is not getting life itself, it's getting complex and intelligent technology creating life.
I highly doubt that will happen on an unstable world like Venus or Mars.
Stability and abundant resources for life to replicate easily and without much catastrophe. I'm guessing oxygen breathing will be a very common thing for most life because of it's ease of combustion for energy.
Four legs if larger then a dog or pig will probably be common also due to constraints of gravity and energy on the life form.
Intelligent life forms need a way to manipulate their environment, that means something like hands to use/make tools, you can't get around that. Tentacles work too, like squid/octopus.
They need a way to eat so mouth and teeth will most likely be everywhere.
Eyes also, I doubt they have exotic eyes, those things evolved a dozen times here on earth and it's always a light sensitive patch. The laws for making an image on a screen are also set, so you can't get around them having pupils and lenses in their eyes.
Just a few things off the top of my head.