What would happen if Earth’s magnetic field did not occasionally reverse polarity?

I looking at a practice test in my book and it has this question:

Try to visit this site..hope it will help you.

Earth’s Inconstant Magnetic Field
… field, typical of the long years between polarity reversals. … sort of complicated magnetic field Earth has during the upheaval of a reversal. [ more] …science.nasa.gov/headlines/y2003/29dec_magneticfield.htm – 18k – Cached

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