Structural physical logically changes with then a species occur over an extended period of time. These changes appear to be the product of the natural selection of favorable traits within that species. These statements best describes the concept of

The answer should be c.

Is there a picture or answer choices?

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.