The heating curve for a substance is shown below.The substance initially is a solid.It then becomes a liquid and a gas.Which of the line segments (I-V) represents the solid-to-liquid phase transition? 
Definitions:
Neural Activity
The functioning and signaling processes within nerve cells or neurons, which comprise the nervous system.
Emotional Reactions
These are immediate responses to external or internal events, encompassing a wide range of feelings such as happiness, anger, sadness, or fear.
Dreams
A series of thoughts, images, and sensations occurring in a person's mind during sleep, reflecting both conscious and unconscious mental activity.
REM Sleep
Rapid Eye Movement sleep, a stage of sleep characterized by vivid dreams and physiological changes like increased brain activity and temporary paralysis of major muscles.
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