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Describe the value of using twins in the study of questions relating to the relative impact of heredity versus environment.
Electronegativity
A characteristic of a chemical nature indicating how strongly an atom pulls electrons toward it within a chemical bond.
Stiffness
The resistance of a material to deformation under stress, often considered in the context of mechanical properties of materials.
Vibration Mode
Specific patterns of movements of atoms within a molecule that occur during vibration, each with a characteristic frequency.
Observable
In physical and analytical sciences, a measurable property or phenomenon that can be detected and quantified through experiments.
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