Final answer:
When milk changes into curd, it undergoes a state change from liquid to solid, may change color, and signifies a state change in the substance.
Explanation:
When milk changes into curd:
- Its state changes from liquid to solid: Milk transforms from a liquid state to a solid state during curdling due to the coagulation of proteins.
- Its changes color: The color change is possible as certain curd cultures may impart a different color to the milk during the curdling process.
- It changes state: The change from liquid to solid represents a state change in the substance.
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