Examlex
The pyloric sphincter prevents backup of chyme from the ____________________ to the ____________________.
Allotropes
Different forms of the same element in the same physical state with different structures and properties.
Atomic Mass Number
The total number of protons and neutrons in the nucleus of an atom, determining its mass.
Atomic
Relating to atoms, the smallest constituent unit of ordinary matter that constitutes a chemical element.
Mass Number
The total number of protons and neutrons in an atom's nucleus.
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