[cryptoz]

> Why not send bacteria which may evolve or may create environment for other form of life?

We should absolutely do that. In fact, we almost certainly will. This isn't mutually exclusive with sending humans, though, it's something we'd do as well. I think the primary function of said bacteria would be to help terraform the planet - warm up the surface, add gasses to the atmosphere, evolve new Martian life forms to continue those processes, etc.