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The sympathetic nervous system
Hydrogen
The first element on the periodic table, with the symbol H, known for being the lightest and most abundant chemical element in the universe.
Lewis Structure
A representation of the distribution of electrons in molecules, illustrating how the valence electrons are arranged among the atoms in the molecule.
Methane
A simple hydrocarbon with the formula CH4, it is the main component of natural gas and a potent greenhouse gas.
Lewis Structure
A graphical representation of the electron distribution around atoms and the chemical bonds that hold the atoms together.
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