Final answer:
On a systems flowchart, a solid line with an arrow typically indicates a Data flow, demonstrating the movement of data within the system.
Step-by-step explanation:
On a systems flowchart, a solid line with an arrow typically indicates a Data flow. This illustrates how data moves through the various parts of the system, showing the direction and path of data transfer from one component to another. Systems flowcharts are essential for visualizing the movement of information, aiding in the understanding and analysis of complex systems. For example, in a process regulating homeostasis, such as the control of blood sugar, a flowchart would show the sequence of elements like detection of blood sugar levels, signaling pathways, and the response that restores balance. Similarly, a flowchart indicating the rate of flow of water through a hose would demonstrate the movement and journey of water from one end to the other, highlighting any intermediary processes or variables.