Examlex
Explain why watery eyes occur when a person gets a common cold.
Molecule
The smallest unit of a chemical compound that can exist, consisting of two or more atoms bonded together.
Atom
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element, consisting of a nucleus surrounded by electrons.
Smallest Unit
The most basic, indivisible component of a substance, such as an atom in elements or a molecule in compounds.
Atom
The fundamental unit of a chemical element, made up of a core of protons and neutrons, with electrons circling this core.
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