Life on an Earth-like planet with solid core?

How big a difference does the Earth's liquid outer core and mantle make for the evolution of complex life?

If all of Earth's parameters would be the same, but it had a solid interior just like Mars, would we still have an atmosphere, liquid water, and a moon? How much weaker would our magnetic field be? Or would we have none?

I seem to remember that Mars has a very thin (or no) atmosphere because it has no liquid core and thus no magnetic field, but could it be that our greater planetary mass would compensate for that? Venus has an atmosphere after all, even though its core seems to be only partially liquid.

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Life on an Earth-like planet with solid core?

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