The Following Questions Refer to the graph below. 
-Which of the following best explains the shift of Sharpland's PPC between 2007 and 2012? An increase in
Definitions:
Human Nervous System
The complex network of nerve cells and fibers that transmits nerve impulses between parts of the body.
Neurotransmitters
Chemicals that transmit signals across a synapse from one neuron to another in the nervous system.
Neuron
A specialized cell of the nervous system that transmits signals electrically and chemically throughout the body.
Action Potential
A temporary reversal of an electric polarization of the membrane in nerve or muscle cells.
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