Specie Variation ExperimentI just wanted to confirm my statement in the "Aliens" topic that:
Because the factors of evolution and specific adaptation/variation of their species on this whole different planet would yield a different result.
I will use a program called "Gene pool" that can randomly assort a set of genes in an environment, and then allow them to adapt to it.

This is pool 1, a completely standard pool. Not alot of food growth, but enough to sustain life.

This is pool 2. With increased food growth, adapting to the current supply is needless, and evolution begins perfecting movement, efficiency, and metabolism.
Now, these pools each have a completely random set of "swimbots" in them. With only an altered environment, the only logistical reasoning you can come up with, is that neither will yield anything similar to the other.
Well, as I monitored the total population of the swimbots and the food pellets, I only confirmed that these pools couldn't be more different:

And then I discovered a small organism in pool 1, that resembled the dominant species in pool 2:

Now, I know this seems to dis-prove my statement, that these pools could not yield the same result, but this only proves it. In pool 1, the variation never actually mated, and died a few seconds after the picture was taken. But in pool 2, the similar variation had created such a large population that it's purple color was the dominant sight of the whole pool.
Next is the result. This will show the dominant species in each pool, and it will mimic humanity, the best adapted species for their environment.
The Whole Pool Result:

My Decided "Humanity" Species:
So if you didn't want to read all that, basically if their is alien life out there, it will have an incredibly small chance of looking remotely like us.