Question

a chemistry professor is preparing a lesson on the phases of matter. read the piece of information in each row, then select the section where it fits best.
sections
definitions examples
matter undergoes a phase change when enough energy is added or removed to alter its physical state (liquid, solid, or gas).
water changes from a liquid phase to a solid phase (ice) when its temperature decreases to 0°c or lower.

Explanation:

For the first statement: "Matter undergoes a phase change when enough energy is added or removed to alter its physical state (liquid, solid, or gas)." This is a definition as it explains what a phase change is. So it fits in the "Definitions" section.
For the second statement: "Water changes from a liquid phase to a solid phase (ice) when its temperature decreases to 0°C or lower." This is an example as it provides a specific instance of a phase change. So it fits in the "Examples" section.

Answer:

First row (Matter undergoes...): Definitions
Second row (Water changes...): Examples