Each biological cell can be regarded as a miniature battery or a miniature magnetic pole. Some people have accurately determined the magnetic activity of the human body and believe that the source of biomagnetism may be: (1) the magnetic field generated by the movement of biological charge; (2) ) Induction fields generated by biomagnetic materials, that is, certain substances in biological tissues have certain magnetic properties, and they are induced by the geomagnetic field or external magnetic field; (3) Magnetic fields generated by ferromagnetic substances in living bodies. What does not fit the meaning of this paragraph? ['Since each cell is a miniature battery and also a magnetic pole, this has the biomagnetism.', 'There is a charge in the living body, and the movement of the charge generates a magnetic field.', 'There is a magnetic substance in the living body, which generates a magnetic field under the action of an external magnetic field.', 'Strongly magnetic substances in living bodies generate magnetic fields on their own.']