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An ordered pair is
Carotid Artery
A major blood vessel that supplies blood to the brain, neck, and face.
Atomic Mass
Atomic mass is the mass of an atom, typically expressed in atomic mass units, reflecting the sum of the number of protons and neutrons in the nucleus.
Protons
Positively charged particles within an atom's nucleus.
Neutrons
Neutrons are subatomic particles found in the nucleus of an atom; they are neutral, having no electric charge and a mass slightly greater than that of protons.
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