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Answer:

Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material

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Answer:

D. Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.