Mars 'has life's building blocks'

[freethought]

4. What it also needs is a much stronger magnetic field.

One of the earth's advantages is a strong magnetic field generated by the spin the earth's core. The magnetic field creates protection against harmful solar radiation.
For whatever reason, Mars's magnetic field is much weaker than the earth's, about 1/10th as powerful, and from what I have read it does not cover the planet evenly. From what I understand it is patchy, stronger in some places than in others. Scientists tend to think that the martian magnetic field is generated from minerals in its crust vs. the spinning dynamo that generates the earth's field.
Just because the "building blocks" are there does not mean life eventually arises.