What happens if the earth’s magnetic field disappears?

The Earth’s magnetic field deflects the flight paths of cosmic rays and high-energy particles from a straight line and directs them to the poles, leaving the rest of the Earth’s surface untouched. If the magnetic field disappears, then these particles will ionize all matter on the Earth’s surface, including living cells, which will lead to their death, the atmosphere will gradually lose matter. Radiation will kill all types of living things, with the exception of bacteria and primitive forms.