2. From monitoring stations around the globe, data was collected to produce the above graphs.
These graphs show atmospheric concentrations of several halogenated gases (gases that contain
fluorine, chlorine, or bromine), measured in parts per trillion (ppt). What is the atom or element
that is present in all of the compounds in the left-hand graph which causes them to be ozone-
depleting substances?

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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the form of energy changes and the total energy increases0l

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.