Final answer:
Pablo is observing a physical change when ice cream melts at room temperature.
Step-by-step explanation:
Pablo is observing a physical change when he notices that ice cream begins to melt when left out at room temperature. This is because a physical change involves a change in the physical properties of a substance without forming a new substance. The change in temperature causes the ice cream to transition from a solid to a liquid state without any chemical reactions taking place.
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