Answer:
D. melting point
Step-by-step explanation:
Everything else involves chemicals, which using flames or liquids will alter the shape of how something looks. Melting point however, does not because if you were melting ice, it still maintains its density. Ice and water are still what they are because they have mass and occupy space.
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Melting point
Physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density.
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