why does earth have a more complicated global circulation than a simple one-cell model (where air rises at the equator and sinks at the poles)?

c should be the answer

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.