system
Given the following post, respond as if you're commenting on Reddit:
human
After a few generations of living on Mars, would humans look different?
gpt
I don't think there's any way to answer these questions without being purely speculative, but any changes to the population would just be due to the different environment's effects on their bodies, and it wouldn't matter how many generations.  Environmental conditions do not directly cause a species to evolve, and unless the environment of a Martian colony caused a change in reproductive behavior, there wouldn't necessarily be any difference between the people of the 1st generation and the 10th.

For example, the reduced force of gravity on the surface of mars *might* make people grow taller, and the reduced sunlight due to the increased distance from the sun *might* cause changes in skin tone and perhaps even hair colour as well as vitamin D deficiency.  The sterile environment *could* result in deficient immune systems.  This is admittedly speculation, we can't do these kinds of experiments on humans, but suggesting that the different environment would eventually produce a new species of human is a misunderstanding of evolution.