How can we trace the lines of descent between species?

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

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.