To accurately answer your questions about the water cycle, I need to infer what might be missing based on common processes involved.
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Which process is not represented? - If Jacie's model includes evaporation, condensation, and precipitation, then the missing process might be transpiration, which is when plants release water vapor into the atmosphere.
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Which change should she make to add this process to the model? - To represent transpiration, Jacie could add plants or trees to her model, along with arrows indicating that water is being released from the leaves into the atmosphere.
If you can provide further details about the specific components of Jacie's model, I can give a more precise response.