A heating curve for some substance is shown below. Which of the line segments (I-V) represents heating of the liquid? 
Definitions:
Obedience
The act of following orders or directions from an authority figure, often without questioning them.
Experimenter
An experimenter is a researcher who conducts experiments, which are structured investigations designed to test hypotheses and understand causal relationships in scientific studies.
Pessimistic
A tendency to see the worst aspect of things or believe that the worst will happen.
Abilities
The skills and competencies that enable an individual to perform specific tasks or activities.
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