A doctor gives a drug to a depressed patient in the belief that the patient’s depression is caused by an abnormal amount of serotonin in the brain and that this drug will correct the abnormality. This doctor would be following the model for explaining causes of psychological disorders.

A) socio-cultural
B) biological
C) psychological
D) humanistic

bacterium is not correct

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.