the layer of the epidermis that includes melanocytes and a single row of columnar cells that undergo mitosis is the

a- all cells come from pre-existing cells

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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.